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screen

Name
     screen - screen manager with VT100/ANSI terminal emulation

Synopsis
     screen [ -options ] [ cmd [ args ] ]
     screen -r [[pid.]tty[.host]]
     screen -r sessionowner/[[pid.]tty[.host]]

Description
     Screen is a full-screen window manager  that  multiplexes  a
     physical   terminal  between  several  processes  (typically
     interactive shells).  Each  virtual  terminal  provides  the
     functions  of a DEC VT100 terminal and, in addition, several
     control functions from the ISO 6429 (ECMA  48,  ANSI  X3.64)
     and  ISO 2022 standards (e.g. insert/delete line and support
     for multiple character sets).  There is a scrollback history
     buffer  for  each  virtual  terminal  and  a  copy-and-paste
     mechanism that allows moving text regions between windows.

     When screen is called, it creates a  single  window  with  a
     shell  in it (or the specified command) and then gets out of
     your way so that you can use the  program  as  you  normally
     would.   Then, at any time, you can create new (full-screen)
     windows with other programs in them (including more shells),
     kill  existing  windows, view a list of windows, turn output
     logging on and off,  copy-and-paste  text  between  windows,
     view the scrollback history, switch between windows in what-
     ever manner you wish, etc. All windows  run  their  programs
     completely  independent  of each other. Programs continue to
     run when their window is currently not visible and even when
     the  whole screen session is detached from the user's termi-
     nal.  When a program terminates, screen (per default)  kills
     the  window  that  contained  it.  If this window was in the
     foreground, the display switches to the previous window;  if
     none  are  left,  screen  exits.  Shells usually distinguish
     between running as login-shell or  sub-shell.   Screen  runs
     them  as  sub-shells,  unless  told  otherwise  (See "shell"
     .screenrc command).

     Everything you type is sent to the program  running  in  the
     current window.  The only exception to this is the one keys-
     troke that is used to  initiate  a  command  to  the  window
     manager.   By  default, each command begins with a control-a
     (abbreviated C-a from now on), and is followed by one  other
     keystroke.   The  command character and all the key bindings
     can be fully customized to be anything you like, though they
     are always two characters in length.

     Screen does not understand the prefix "C-" to mean  control,
     although  this notation is used in this manual for readabil-
     ity. Please use the caret notation ("^A" instead  of  "C-a")
     as  arguments  to  e.g. the escape command or the -e option.
     Screen will also print out control characters in caret nota-
     tion.

     The standard way to create a new window is to type "C-a  c".
     This  creates  a  new window running a shell and switches to
     that window immediately, regardless of the state of the pro-
     cess  running  in  the  current  window.  Similarly, you can
     create a new window with a custom command  in  it  by  first
     binding  the  command to a keystroke (in your .screenrc file
     or at the "C-a :" command line) and then using it just  like
     the  "C-a  c"  command.   In  addition,  new  windows can be
     created by running a command like:

          screen emacs prog.c

     from a shell prompt  within  a  previously  created  window.
     This  will  not run another copy of screen, but will instead
     supply the command name and  its  arguments  to  the  window
     manager  (specified  in  the  $STY environment variable) who
     will use it to create the new  window.   The  above  example
     would  start the emacs editor (editing prog.c) and switch to
     its window. - Note that  you  cannot  transport  environment
     variables  from the invoking shell to the application (emacs
     in this case), because it is forked from the  parent  screen
     process, not from the invoking shell.

     If "/etc/utmp" is writable by screen, an appropriate  record
     will  be  written  to this file for each window, and removed
     when the window is terminated.  This is useful  for  working
     with "talk", "script", "shutdown", "rsend", "sccs" and other
     similar programs that use the utmp file to determine who you
     are.  As  long  as  screen  is  active on your terminal, the
     terminal's own record is removed from  the  utmp  file.  See
     also "C-a L".

Getting Started
     Before you begin to use screen you'll need to make sure  you
     have  correctly  selected  your  terminal  type, just as you
     would for any other termcap/terminfo program.  (You  can  do
     this by using tset for example.)

     If you're impatient and want to get started without doing  a
     lot  more  reading,  you  should  remember this one command:
     "C-a ?".  Typing these two characters will display a list of
     the available screen commands and their bindings. Each keys-
     troke is discussed in the section  "DEFAULT  KEY  BINDINGS".

     The  manual  section "CUSTOMIZATION" deals with the contents
     of your .screenrc.

     If your  terminal  is  a  "true"  auto-margin  terminal  (it
     doesn't  allow the last position on the screen to be updated
     without scrolling the screen) consider using  a  version  of
     your  terminal's  termcap  that has automatic margins turned
     off. This will ensure an accurate and optimal update of  the
     screen  in  all  circumstances. Most terminals nowadays have
     "magic" margins (automatic margins plus usable last column).
     This  is  the  VT100  style  type  and  perfectly suited for
     screen.  If all you've got is a "true" auto-margin  terminal
     screen  will  be content to use it, but updating a character
     put into the last position on the screen may not be possible
     until  the  screen  scrolls or the character is moved into a
     safe position in some other way. This delay can be shortened
     by using a terminal with insert-character capability.

Command-line Options
     Screen has the following command-line options:

     -a   include all capabilities (with some  minor  exceptions)
          in  each  window's  termcap, even if screen must redraw
          parts of the display in order to implement a function.

     -A   Adapt the sizes of all  windows  to  the  size  of  the
          current  terminal.  By default, screen tries to restore
          its old window sizes when attaching to resizable termi-
          nals  (those  with "WS" in its description, e.g. suncmd
          or some xterm).

     -c file
          override   the   default   configuration   file    from
          "$HOME/.screenrc" to file.

     -d|-D [pid.tty.host]
          does not start screen, but detaches the elsewhere  run-
          ning  screen  session. It has the same effect as typing
          "C-a d" from screen's controlling terminal. -D  is  the
          equivalent  to the power detach key.  If no session can
          be detached, this option  is  ignored.  In  combination
          with  the  -r/-R  option  more  powerful effects can be
          achieved:

     -d -r   Reattach a session and if necessary detach it first.

     -d -R   Reattach a session and if necessary detach  or  even
             create it first.

     -d -RR  Reattach a session and if necessary detach or create

             it.  Use  the first session if more than one session
             is available.

     -D -r   Reattach a session. If necessary detach  and  logout
             remotely first.

     -D -R   Attach here and now. In detail this means: If a ses-
             sion  is running, then reattach. If necessary detach
             and logout remotely first.  If it  was  not  running
             create  it and notify the user. This is the author's
             favorite.

     -D -RR  Attach here and now. Whatever that  means,  just  do
             it.

          Note: It is always a good idea to check the  status  of
          your sessions by means of "screen -list".

     -e xy
          specifies the command character to be x and the charac-
          ter  generating  a literal command character to y (when
          typed after the command  character).   The  default  is
          "C-a" and `a', which can be specified as "-e^Aa".  When
          creating a screen session, this option sets the default
          command  character.  In  a  multiuser session all users
          added will start off with this command  character.  But
          when  attaching  to  an  already  running session, this
          option  changes  only  the  command  character  of  the
          attaching  user.   This  option is equivalent to either
          the commands "defescape" or "escape" respectively.

     -f, -fn, and -fa
          turns flow-control on,  off,  or  "automatic  switching
          mode".   This can also be defined through the "defflow"
          .screenrc command.

     -h num
          Specifies the history scrollback buffer to be num lines
          high.

     -i   will cause the interrupt key (usually C-c) to interrupt
          the  display  immediately when flow-control is on.  See
          the "defflow" .screenrc command for details.   The  use
          of this option is discouraged.

     -l and -ln
          turns login mode on or off  (for  /etc/utmp  updating).
          This   can  also  be  defined  through  the  "deflogin"
          .screenrc command.

     -ls [match]
     -list [match]

          does  not  start  screen,  but   prints   a   list   of
          pid.tty.host  strings identifying your screen sessions.
          Sessions marked `detached' can be resumed with  "screen
          -r".  Those  marked  `attached'  are running and have a
          controlling terminal. If the session runs in  multiuser
          mode,   it   is  marked  `multi'.  Sessions  marked  as
          `unreachable' either live on a different  host  or  are
          `dead'.   An  unreachable  session  is considered dead,
          when its name matches either  the  name  of  the  local
          host,  or  the specified parameter, if any.  See the -r
          flag for a description how to construct matches.   Ses-
          sions marked as `dead' should be thoroughly checked and
          removed. Ask your system administrator if you  are  not
          sure. Remove sessions with the -wipe option.

     -L   tells screen to turn on automatic  output  logging  for
          the windows.

     -Logfile file
          By default logfile name is "screenlog.0". You  can  set
          new logfile name with the "-Logfile" option.

     -m   causes screen to ignore the $STY environment  variable.
          With "screen -m" creation of a new session is enforced,
          regardless whether screen is called from within another
          screen  session or not. This flag has a special meaning
          in connection with the `-d' option:

     -d -m   Start screen in "detached" mode. This creates a  new
             session but doesn't attach to it. This is useful for
             system startup scripts.

     -D -m   This also starts  screen  in  "detached"  mode,  but
             doesn't fork a new process. The command exits if the
             session terminates.

     -O   selects a more optimal output mode  for  your  terminal
          rather  than  true  VT100 emulation (only affects auto-
          margin terminals without `LP').  This can also  be  set
          in  your  .screenrc  by  specifying `OP' in a "termcap"
          command.

     -p number_or_name|-|=|+
          Preselect a window. This is useful  when  you  want  to
          reattach  to  a  specific  window or you want to send a
          command via the "-X" option to a  specific  window.  As
          with  screen's  select  command,  "-" selects the blank
          window. As a special case for reattach, "="  brings  up
          the  windowlist  on  the blank window, while a "+" will
          create a new window. The command will not  be  executed
          if the specified window could not be found.

     -q   Suppress printing of  error  messages.  In  combination
          with  "-ls" the exit value is as follows: 9 indicates a
          directory without sessions. 10  indicates  a  directory
          with  running but not attachable sessions. 11 (or more)
          indicates 1 (or more) usable sessions.  In  combination
          with  "-r"  the  exit value is as follows: 10 indicates
          that there is no session to resume. 12 (or more)  indi-
          cates that there are 2 (or more) sessions to resume and
          you should specify which one to choose.  In  all  other
          cases "-q" has no effect.

     -Q   Some commands now can be queried from a remote  session
          using this flag, e.g. "screen -Q windows". The commands
          will send the response to the stdout  of  the  querying
          process. If there was an error in the command, then the
          querying process will exit with a non-zero status.

          The commands that can be queried now are:
           echo
           info
           lastmsg
           number
           select
           time
           title
           windows

     -r [pid.tty.host]
     -r sessionowner/[pid.tty.host]
          resumes a detached screen session.   No  other  options
          (except  combinations  with  -d/-D)  may  be specified,
          though an optional  prefix  of  [pid.]tty.host  may  be
          needed  to distinguish between multiple detached screen
          sessions.  The  second  form  is  used  to  connect  to
          another  user's  screen session which runs in multiuser
          mode. This indicates that screen should look  for  ses-
          sions   in  another  user's  directory.  This  requires
          setuid-root.

     -R   resumes screen only when it's unambiguous which one  to
          attach,  usually when only one screen is detached. Oth-
          erwise  lists  available  sessions.   -RR  attempts  to
          resume  the first detached screen session it finds.  If
          successful, all other command-line options are ignored.
          If  no  detached  session  exists, starts a new session
          using the specified options, just as if -R had not been
          specified.  The  option  is set by default if screen is
          run as a login-shell (actually screen  uses  "-xRR"  in
          that case).  For combinations with the -d/-D option see
          there.

     -s program

          sets  the  default  shell  to  the  program  specified,
          instead of the value in the environment variable $SHELL
          (or "/bin/sh"  if  not  defined).   This  can  also  be
          defined  through  the  "shell"  .screenrc command.  See
          also there.

     -S sessionname
          When creating a new session, this option can be used to
          specify  a  meaningful  name for the session. This name
          identifies the session for "screen -list"  and  "screen
          -r" actions. It substitutes the default [tty.host] suf-
          fix.

     -t name
          sets the title (a.k.a.) for the default shell or speci-
          fied program.  See also the "shelltitle" .screenrc com-
          mand.

     -T term
          Set the $TERM environment variable using the  specified
          term as opposed to the default setting of screen.

     -U   Run screen in UTF-8 mode. This option tells screen that
          your terminal sends and understands UTF-8 encoded char-
          acters. It also sets the default encoding for new  win-
          dows to `utf8'.

     -v   Print version number.

     -wipe [match]
          does the same as "screen -ls",  but  removes  destroyed
          sessions   instead  of  marking  them  as  `dead'.   An
          unreachable session is considered dead, when  its  name
          matches  either  the  name  of  the  local host, or the
          explicitly given parameter, if any.  See  the  -r  flag
          for a description how to construct matches.

     -x   Attach to a not detached screen session. (Multi display
          mode).   Screen  refuses  to attach from within itself.
          But when cascading  multiple  screens,  loops  are  not
          detected; take care.

     -X   Send the specified command to a running screen session.
          You may use the -S option to specify the screen session
          if you have several screen sessions  running.  You  can
          use the -d or -r option to tell screen to look only for
          attached or detached screen sessions.  Note  that  this
          command  doesn't  work  if the session is password pro-
          tected.


     -4   Resolve hostnames only to IPv4 addresses.

     -6   Resolve hostnames only to IPv6 addresses.

Default Key Bindings
     As mentioned, each screen command consists of a  "C-a"  fol-
     lowed  by  one  other  character.  For your convenience, all
     commands that are bound to lower-case letters are also bound
     to  their control character counterparts (with the exception
     of "C-a a"; see below), thus, "C-a c" as well as  "C-a  C-c"
     can  be used to create a window. See section "CUSTOMIZATION"
     for a description of the command.

     The following table shows  the  default  key  bindings.  The
     trailiing  commas  in  boxes with multiple keystroke entries
     are separators, not part of the bindings.  allbox tab(;); lb
     l  l.   C-a `;(select);T{ Prompt for a window name or number
     to switch to.  T} C-a [dq];(windowlist -b);T{ Present a list
     of  all windows for selection.  T} C-a digit;(select 0-9);T{
     Switch to window number 0 - 9 T} C-a -;(select -);T{  Switch
     to  window  number  0  -  9, or to the blank window.  T} C-a
     tab;(focus);T{ Switch the input focus to  the  next  region.
     See  also split, remove, only.  T} C-a C-a;(other);T{ Toggle
     to the window displayed previously.  Note that this  binding
     defaults  to the command character typed twice, unless over-
     ridden.  For instance, if you use the  option  "-e]x",  this
     command becomes "]]".  T} C-a a  ;(meta);T{ Send the command
     character (C-a) to  window.  See  escape  command.   T}  C-a
     A;(title);T{  Allow the user to enter a name for the current
     window.  T} T{ C-a b,
     C-a C-b T};(break);T{  Send  a  break  to  window.   T}  C-a
     B;(pow_break);T{  Reopen the terminal line and send a break.
     T} T{ C-a c,
     C-a C-c T};(screen);T{ Create a new window with a shell  and
     switch  to  that  window.   T}  C-a  C;(clear);T{  Clear the
     screen.  T} T{ C-a d,
     C-a C-d T};(detach);T{ Detach screen from this terminal.  T}
     C-a D D;(pow_detach);T{ Detach and logout.  T} T{ C-a f,
     C-a C-f T};(flow);T{ Toggle flow on, off or  auto.   T}  C-a
     F;(fit);T{ Resize the window to the current region size.  T}
     C-a C-g;(vbell);T{ Toggles screen's visual  bell  mode.   T}
     C-a  h;(hardcopy);T{  Write a hardcopy of the current window
     to the file "hardcopy.n".   T}  C-a  H;(log);T{  Begins/ends
     logging of the current window to the file "screenlog.n".  T}
     T{ C-a i,
     C-a C-i T};(info);T{ Show info about this window.  T} T{ C-a
     k,
     C-a C-k T};(kill);T{ Destroy current window.  T} T{ C-a l,
     C-a C-l T};(redisplay);T{ Fully refresh current window.   T}
     C-a  L;(login);T{  Toggle this windows login slot. Available
     only if screen is configured to update  the  utmp  database.
     T{ C-a m,
     C-a C-m T};(lastmsg);T{ Repeat the last message displayed in
     the  message line.  T} C-a M;(monitor);T{ Toggles monitoring
     of the current window.  T} T{ C-a space,
     C-a n,
     C-a C-n T};(next);T{ Switch to  the  next  window.   T}  C-a
     N;(number);T{  Show  the  number  (and title) of the current
     window.  T} T{ C-a backspace,
     C-a C-h,
     C-a p,
     C-a C-p T};(prev);T{ Switch to the previous window (opposite
     of C-a n).  T} T{ C-a q,
     C-a C-q T};(xon);T{ Send a control-q to the current  window.
     T}  C-a  Q;(only);T{ Delete all regions but the current one.
     See also split, remove, focus.  T} T{ C-a r,
     C-a C-r T};(wrap);T{ Toggle the current  window's  line-wrap
     setting  (turn the current window's automatic margins on and
     off).  T} T{ C-a s,
     C-a C-s; T};(xoff);T{ Send a control-s to the  current  win-
     dow.   T} C-a S;(split);T{ Split the current region horizon-
     tally into two new ones.  See also only, remove, focus.   T}
     T{ C-a t,
     C-a  C-t  T};(time);T{  Show  system  information.   T}  C-a
     v;(version);T{ Display the version and compilation date.  T}
     C-a C-v;(digraph);T{ Enter digraph.  T} T{ C-a w,
     C-a C-w T};(windows);T{ Show  a  list  of  window.   T}  C-a
     W;(width);T{  Toggle  80/132  columns.   T}  C-a x or C-a C-
     x;(lockscreen);T{ Lock this terminal.  T} C-a X ;(remove);T{
     Kill  the  current region.  See also split, only, focus.  T}
     T{ C-a z,
     C-a C-z T};(suspend);T{ Suspend screen.   Your  system  must
     support  BSD-style  job-control.   T} C-a Z;(reset);T{ Reset
     the virtual terminal  to  its  "power-on"  values.   T}  C-a
     .;(dumptermcap);T{  Write  out  a  ".termcap"  file.  T} C-a
     ?;(help);T{ Show key bindings.  T} C-a \;(quit);T{ Kill  all
     windows  and  terminate  screen.   T} C-a :;(colon);T{ Enter
     command line mode.  T} T{ C-a [,
     C-a C-[,
     C-a esc T};(copy);T{ Enter copy/scrollback mode.  T} T{  C-a
     C-],
     C-a ] T};(paste .);T{ Write the contents of the paste buffer
     to the stdin queue of the current window. T} T{ C-a {,
     C-a } T};(history);T{ Copy and paste  a  previous  (command)
     line.   T} C-a >;(writebuf);T{ Write paste buffer to a file.
     T} C-a <;(readbuf);T{ Reads the  screen-exchange  file  into
     the  paste buffer.  T} C-a =;(removebuf);T{ Removes the file
     used by C-a < and C-a >.  T} C-a ,;(license);T{ Shows  where
     screen  comes from, where it went to and why you can use it.
     T} C-a _;(silence);T{ Start/stop monitoring the current win-
     dow  for  inactivity.   T}  C-a  |;(split  -v);T{  Split the
     current  region  vertically  into  two  new  ones.   T}  C-a
     *;(displays);T{  Show  a  listing  of all currently attached
     displays.  T}

Customization
     The "socket directory" defaults either to  $HOME/.screen  or
     simply  to  /tmp/screens or preferably to /usr/local/screens
     chosen at compile-time. If screen is installed  setuid-root,
     then  the  administrator  should compile screen with an ade-
     quate (not NFS mounted) socket directory. If screen  is  not
     running  setuid-root,  the  user  can  specify  any mode 700
     directory in the environment variable $SCREENDIR.

     When screen is invoked, it executes initialization  commands
     from  the files "/usr/local/etc/screenrc" and ".screenrc" in
     the user's  home  directory.  These  are  the  "programmer's
     defaults"  that can be overridden in the following ways: for
     the global screenrc file screen searches for the environment
     variable $SYSSCREENRC (this override feature may be disabled
     at  compile-time).  The  user  specific  screenrc  file   is
     searched  in  $SCREENRC,  then $HOME/.screenrc.  The command
     line option -c takes precedence over the above user screenrc
     files.

     Commands in these files are used to set options, bind  func-
     tions  to  keys,  and to automatically establish one or more
     windows at the beginning of your screen  session.   Commands
     are  listed one per line, with empty lines being ignored.  A
     command's arguments are separated by tabs or spaces, and may
     be  surrounded  by single or double quotes.  A `#' turns the
     rest of the line into a comment, except in quotes.  Unintel-
     ligible  lines  are  warned about and ignored.  Commands may
     contain references to environment variables. The  syntax  is
     the  shell-like  "$VAR  " or "${VAR}". Note that this causes
     incompatibility with previous screen versions,  as  now  the
     `$'-character  has  to  be protected with `\' if no variable
     substitution shall be performed. A string  in  single-quotes
     is also protected from variable substitution.

     Two configuration files are shipped as  examples  with  your
     screen  distribution:  "etc/screenrc" and "etc/etcscreenrc".
     They contain a number of useful examples  for  various  com-
     mands.

     Customization can also be done `on-line'. To enter the  com-
     mand  mode  type  `C-a  :'. Note that commands starting with
     "def" change default values,  while  others  change  current
     settings.

     The following commands are available:

     acladd usernames [crypted-pw]

     addacl usernames

     Enable users to fully access this screen session.  Usernames
     can  be  one  user  or a comma separated list of users. This
     command enables to attach to the screen session and performs
     the  equivalent  of `aclchg usernames +rwx "#?"'.  executed.
     To add a user with restricted access, use the `aclchg'  com-
     mand below.  If an optional second parameter is supplied, it
     should be a crypted password for the named user(s). `Addacl'
     is a synonym to `acladd'.  Multi user mode only.

     aclchg usernames permbits list

     chacl usernames permbits list

     Change permissions for a comma separated list of users. Per-
     mission  bits are represented as `r', `w' and `x'. Prefixing
     `+' grants the permission, `-' removes it. The third parame-
     ter  is  a  comma  separated list of commands and/or windows
     (specified either by number or title). The special list  `#'
     refers  to  all  windows,  `?' to all commands. if usernames
     consists of a single `*', all known users are affected.

     A command can be executed when the user has the `x' bit  for
     it.  The user can type input to a window when he has its `w'
     bit set and no other user obtains a writelock for this  win-
     dow.  Other bits are currently ignored. To withdraw the wri-
     telock from another user in window 2:  `aclchg username -w+w
     2'.  To allow read-only access to the session: `aclchg user-
     name -w "#"'. As soon as a user's name is known to screen he
     can attach to the session and (per default) has full permis-
     sions for all command and windows. Execution permission  for
     the  acl commands, `at' and others should also be removed or
     the user may be able to regain write permission.  Rights  of
     the  special username nobody cannot be changed (see the "su"
     command).  `Chacl' is a synonym  to  `aclchg'.   Multi  user
     mode only.

     acldel username

     Remove  a  user  from  screen's  access  control  list.   If
     currently  attached,  all  the  user's displays are detached
     from the session. He cannot attach again.  Multi  user  mode
     only.

     aclgrp username [groupname]

     Creates groups of users that share common access rights. The
     name  of the group is the username of the group leader. Each
     member of  the  group  inherits  the  permissions  that  are
     granted  to the group leader. That means, if a user fails an
     access check, another check is made for the group leader.  A
     user  is removed from all groups the special value "none" is
     used for groupname.  If the second parameter is omitted  all
     groups the user is in are listed.

     aclumask [[ users ] +bits | [ users ] -bits... ]

     umask [[ users ] +bits | [ users ] -bits... ]

     This specifies the access other users have to  windows  that
     will  be created by the caller of the command.  Users may be
     no, one or a comma separated list of known usernames. If  no
     users  are specified, a list of all currently known users is
     assumed. Bits is any  combination  of  access  control  bits
     allowed defined with the "aclchg" command. The special user-
     name "?" predefines the access that not yet known users will
     be  granted  to  any window initially.  The special username
     "??" predefines the access that  not  yet  known  users  are
     granted  to  any  command.  Rights  of  the special username
     nobody cannot be changed (see the "su" command).  `Umask' is
     a synonym to `aclumask'.

     activity message

     When any activity occurs in  a  background  window  that  is
     being  monitored, screen displays a notification in the mes-
     sage line.  The notification message can  be  re-defined  by
     means  of the "activity" command.  Each occurrence of `%' in
     message is replaced by the number of  the  window  in  which
     activity  has  occurred,  and  each  occurrence  of  `^G' is
     replaced by the definition for bell in your termcap (usually
     an audible bell).  The default message is

                 `Activity in window %n'

     Note that monitoring is off for all windows by default,  but
     can be altered by use of the "monitor" command (C-a M).

     allpartial on|off

     If set to on, only the current cursor line is  refreshed  on
     window  change.   This affects all windows and is useful for
     slow terminal lines. The previous  setting  of  full/partial
     refresh  for  each window is restored with "allpartial off".
     This is a global flag that immediately takes effect  on  all
     windows  overriding  the  "partial"  settings.  It  does not
     change the default redraw behavior of newly created windows.

     altscreen on|off

     If set to on, "alternate screen" support is enabled in  vir-
     tual  terminals,  just  like  in  xterm.  Initial setting is
     `off'.

     at [identifier][#|*|%] command [args

     Execute a command at other displays or windows as if it  had
     been  entered there.  "At" changes the context (the `current
     window' or `current display' setting) of the command. If the
     first  parameter describes a non-unique context, the command
     will be executed multiple times. If the first  parameter  is
     of the form `identifier*' then identifier is matched against
     user names.  The command is executed once for  each  display
     of  the  selected  user(s). If the first parameter is of the
     form `identifier%' identifier is matched  against  displays.
     Displays  are  named  after the ttys they attach. The prefix
     `/dev/' or `/dev/tty' may be omitted  from  the  identifier.
     If  identifier  has  a `#' or nothing appended it is matched
     against window numbers and titles. Omitting an identifier in
     front  of  the  `#', `*' or `%'-character selects all users,
     displays or windows because  a  prefix-match  is  performed.
     Note  that  on  the affected display(s) a short message will
     describe what happened. Permission is checked for  initiator
     of  the  "at"  command,  not  for the owners of the affected
     display(s).  Note that the `#' character works as a  comment
     introducer  when  it  is preceded by whitespace. This can be
     escaped by prefixing a `\'. Permission is  checked  for  the
     initiator  of  the  "at"  command, not for the owners of the
     affected display(s).

     Caveat: When matching against windows, the command  is  exe-
     cuted  at  least  once  per window. Commands that change the
     internal arrangement of windows (like "other") may be called
     again.  In  shared  windows the command will be repeated for
     each attached display. Beware, when issuing toggle  commands
     like "login"!  Some commands (e.g. "process") require that a
     display is associated with the target windows.   These  com-
     mands  may  not  work correctly under "at" looping over win-
     dows.

     attrcolor attrib [attribute/color-modifier]

     This command can be used to highlight attributes by changing
     the  color  of  the text. If the attribute attrib is in use,
     the specified attribute/color modifier is also  applied.  If
     no  modifier  is  given, the current one is deleted. See the
     "STRING ESCAPES" chapter for the  syntax  of  the  modifier.
     Screen  understands  two  pseudo-attributes,  "i" stands for
     high-intensity foreground color and "I"  for  high-intensity
     background color.

     Examples:

          attrcolor b "R"

     Change the color to  bright  red  if  bold  text  is  to  be
     printed.

          attrcolor u "-u b"

     Use blue text instead of underline.

          attrcolor b ".I"

     Use bright colors for bold text. Most terminal emulators  do
     this already.

          attrcolor i "+b"

     Make bright colored text also bold.

     autodetach on|off

     Sets whether screen will automatically detach  upon  hangup,
     which saves all your running programs until they are resumed
     with a screen -r command.  When turned off, a hangup  signal
     will  terminate  screen  and  all the processes it contains.
     Autodetach is on by default.

     autonuke on|off

     Sets whether a clear screen sequence  should  nuke  all  the
     output  that  has not been written to the terminal. See also
     "obuflimit".

     backtick id lifespan autorefresh cmd args…

     backtick id

     Program the backtick command with the numerical id id.   The
     output  of  such  a  command is used for substitution of the
     "%`" string escape. The specified lifespan is the number  of
     seconds the output is considered valid. After this time, the
     command is run again if a  corresponding  string  escape  is
     encountered.    The   autorefresh   parameter   triggers  an
     automatic refresh for caption and hardstatus  strings  after
     the  specified number of seconds. Only the last line of out-
     put is used for substitution.

     If both the lifespan  and  the  autorefresh  parameters  are
     zero,  the backtick program is expected to stay in the back-
     ground and generate output once in a while.  In  this  case,
     the  command  is  executed  right away and screen stores the
     last line of output. If a new line gets printed screen  will
     automatically refresh the hardstatus or the captions.

     The second form of the command deletes the backtick  command
     with the numerical id id.

     bce [on|off]

     Change background-color-erase setting. If "bce"  is  set  to
     on,  all  characters cleared by an erase/insert/scroll/clear
     operation will be displayed in the current background color.
     Otherwise the default background color is used.

     bell_msg [message]

     When a bell character is sent to a background window, screen
     displays  a notification in the message line.  The notifica-
     tion message  can  be  re-defined  by  this  command.   Each
     occurrence  of  `%'  in message is replaced by the number of
     the  window  to  which  a  bell  has  been  sent,  and  each
     occurrence of `^G' is replaced by the definition for bell in
     your termcap (usually an audible bell).  The default message
     is

                      `Bell in window %n'

     An empty message can be supplied to the  "bell_msg"  command
     to suppress output of a message line (bell_msg "").  Without
     parameter, the current message is shown.

     bind [class] key [

     Bind a command to a key.  By default, most of  the  commands
     provided  by  screen  are bound to one or more keys as indi-
     cated in the "DEFAULT KEY BINDINGS" section, e.g.  the  com-
     mand  to create a new window is bound to "C-c" and "c".  The
     "bind" command can be used to redefine the key bindings  and
     to define new bindings.  The key argument is either a single
     character, a two-character sequence of the form "^x"  (mean-
     ing  "C-x"), a backslash followed by an octal number (speci-
     fying the ASCII code of the character), or a backslash  fol-
     lowed  by  a  second  character,  such as "\^" or "\\".  The
     argument can also be quoted, if you  like.   If  no  further
     argument  is  given,  any previously established binding for
     this key is removed.  The command argument can be  any  com-
     mand listed in this section.

     If a command class is specified via the "-c" option, the key
     is  bound for the specified class. Use the "command" command
     to activate a class. Command classes can be used  to  create
     multiple command keys or multi-character bindings.

     Some examples:

                 bind ` ` windows
                 bind ^k
                 bind k
                 bind K kill
                 bind ^f screen telnet foobar
                 bind \033 screen -ln -t root -h 1000 9 su

     would bind the space key to the command that displays a list
     of windows (so that the command usually invoked by "C-a C-w"
     would also be available as  "C-a  space").  The  next  three
     lines  remove  the  default  kill binding from "C-a C-k" and
     "C-a k". "C-a K" is then bound to the kill command. Then  it
     binds  "C-f"  to  the command "create a window with a TELNET
     connection to foobar", and bind "escape" to the command that
     creates  an  non-login window with a.k.a. "root" in slot #9,
     with a superuser shell  and  a  scrollback  buffer  of  1000
     lines.

                 bind -c demo1 0 select 10
                 bind -c demo1 1 select 11
                 bind -c demo1 2 select 12
                 bindkey "^B" command -c demo1

     makes "C-b 0" select window 10, "C-b 1" window 11, etc.

                 bind -c demo2 0 select 10
                 bind -c demo2 1 select 11
                 bind -c demo2 2 select 12
                 bind - command -c demo2

     makes "C-a - 0" select window 10, "C-a - 1" window 11, etc.

     bindkey [-d] [-m] [

     This command  manages  screen's  input  translation  tables.
     Every  entry  in one of the tables tells screen how to react
     if a certain sequence of characters  is  encountered.  There
     are  three  tables:   one  that  should contain actions pro-
     grammed by the user, one for the default  actions  used  for
     terminal emulation and one for screen's copy mode to do cur-
     sor movement. See section "INPUT TRANSLATION" for a list  of
     default key bindings.

     If the -d option is  given,  bindkey  modifies  the  default
     table,  -m  changes  the  copy  mode  table and with neither
     option the user table is selected.  The argument  string  is
     the sequence of characters to which an action is bound. This
     can either be a fixed string or a termcap keyboard  capabil-
     ity name (selectable with the -k option).

     Some keys on a VT100 terminal can send a different string if
     application  mode  is turned on (e.g the cursor keys).  Such
     keys have two entries in  the  translation  table.  You  can
     select  the  application  mode  entry  by  specifying the -a
     option.

     The -t option tells screen not to do inter-character timing.
     One  cannot  turn  off the timing if a termcap capability is
     used.

     Cmd can be any of screen's commands with an arbitrary number
     of  args.  If cmd is omitted the key-binding is removed from
     the table.

     Here are some examples of keyboard bindings:

             bindkey -d
     Show all of the default key bindings. The  application  mode
     entries are marked with [A].

             bindkey -k k1 select 1
     Make the "F1" key switch to window one.

             bindkey -t foo stuff barfoo
     Make "foo" an abbreviation of the word "barfoo". Timeout  is
     disabled so that users can type slowly.

             bindkey "\024" mapdefault
     This key-binding makes "^T" an  escape  character  for  key-
     bindings.  If  you did the above "stuff barfoo" binding, you
     can enter the word "foo" by typing "^Tfoo". If you  want  to
     insert  a "^T" you have to press the key twice (i.e., escape
     the escape binding).

             bindkey -k F1 command
     Make the F11 (not F1!)  key  an  alternative  screen  escape
     (besides ^A).

     break[duration]

     Send a break signal for duration*0.25 seconds to  this  win-
     dow.  For non-Posix systems the time interval may be rounded
     up to full seconds.  Most useful if a  character  device  is
     attached to the window rather than a shell process (See also
     chapter "WINDOW TYPES"). The maximum  duration  of  a  break
     signal is limited to 15 seconds.

     blanker

     Activate the screen blanker. First the screen is cleared. If
     no  blanker  program  is  defined, the cursor is turned off,
     otherwise, the program is started and it's output is written
     to  the screen.  The screen blanker is killed with the first
     keypress, the read key is discarded.

     This command is normally used together with the "idle"  com-
     mand.

     blankerprg [program-args]

     Defines a blanker program. Disables the blanker  program  if
     an  empty argument is given. Shows the currently set blanker
     program if no arguments are given.

    breaktype [tcsendbreak|TIOCSBRK

     Choose one of the available methods of  generating  a  break
     signal  for terminal devices. This command should affect the
     current window only.  But  it  still  behaves  identical  to
     "defbreaktype". This will be changed in the future.  Calling
     "breaktype" with no parameter displays the break method  for
     the current window.

     bufferfile [exchange-file]

     Change the filename used for reading and  writing  with  the
     paste  buffer.  If the optional argument to the "bufferfile"
     command     is     omitted,     the     default      setting
     ("/tmp/screen-exchange")   is  reactivated.   The  following
     example will paste  the  system's  password  file  into  the
     screen   window  (using  the  paste  buffer,  where  a  copy
     remains):

                 C-a : bufferfile /etc/passwd
                 C-a < C-a ]
                 C-a : bufferfile

     bumpleft

     Swaps window with previous one on window list.

     bumpright

     Swaps window with next one on window list.

     c1 [on|off]

     Change c1 code processing. "C1 on" tells screen to treat the
     input  characters  between 128 and 159 as control functions.
     Such an 8-bit code is normally the same as ESC  followed  by
     the corresponding 7-bit code. The default setting is to pro-
     cess c1 codes and can be changed with the  "defc1"  command.
     Users with fonts that have usable characters in the c1 posi-
     tions may want to turn this off.

     caption [ top | bottom ] always|splitonly[string]

     caption string [string]

     This command controls the display of  the  window  captions.
     Normally  a  caption is only used if more than one window is
     shown on the display (split screen mode). But if the type is
     set to always screen shows a caption even if only one window
     is displayed. The default is splitonly.

     The second form changes the text used for the  caption.  You
     can  use  all  escapes  from  the  "STRING ESCAPES" chapter.
     Screen uses a default of `%3n %t'.

     You can mix both forms by providing a  string  as  an  addi-
     tional argument.

     You can have the caption displayed either at the top or bot-
     tom of the window.  The default is bottom.

     charset set

     Change the current character set slot designation and  char-
     set mapping.  The first four character of set are treated as
     charset designators while the fifth and sixth character must
     be in range `0' to `3' and set the GL/GR charset mapping. On
     every position a `.'  may  be  used  to  indicate  that  the
     corresponding  charset/mapping should not be changed (set is
     padded  to  six  characters  internally  by  appending   `.'
     chars). New windows have "BBBB02" as default charset, unless
     a "encoding" command is active.
     The current setting can be viewed with the "info" command.

     chdir [directory]

     Change the current directory  of  screen  to  the  specified
     directory  or,  if  called without an argument, to your home
     directory (the value of  the  environment  variable  $HOME).
     All  windows  that are created by means of the "screen" com-
     mand from within ".screenrc" or by means of  "C-a  :  screen
     …"  or  "C-a  c"  use  this  as  their  default directory.
     Without a chdir command, this would be  the  directory  from
     which screen was invoked.

     Hardcopy and log files are always written  to  the  window's
     default  directory, not the current directory of the process
     running in the window.  You can use  this  command  multiple
     times  in  your  .screenrc  to start various windows in dif-
     ferent default directories, but the last  chdir  value  will
     affect all the windows you create interactively.

     cjkwidth [ on | off ]

     Treat ambiguous width characters as full/half width.

     clear

     Clears the current window and saves its image to the scroll-
     back buffer.

     collapse

     Reorders window on window list, removing number gaps between
     them.

     colon [prefix]

     Allows you to enter ".screenrc" command  lines.  Useful  for
     on-the-fly  modification  of  key  bindings, specific window
     creation and changing settings. Note that the "set"  keyword
     no longer exists! Usually commands affect the current window
     rather than default  settings  for  future  windows.  Change
     defaults with commands starting with `def…'.

     If you consider this as the `Ex command mode' of screen, you
     may regard "C-a esc" (copy mode) as its `Vi command mode'.

     command [-c class]

     This command has the same effect as typing the screen escape
     character (^A). It is probably only useful for key bindings.
     If the "-c" option is given, select  the  specified  command
     class.  See also "bind" and "bindkey".

     compacthist [on|off]

     This tells screen whether to suppress trailing  blank  lines
     when scrolling up text into the history buffer.

     console [on|off]

     Grabs or un-grabs the machines console output to  a  window.
     Note:   Only  the owner of /dev/console can grab the console
     output.  This command is only available if the machine  sup-
     ports the ioctl TIOCCONS.

     copy

     Enter copy/scrollback mode. This allows  you  to  copy  text
     from  the  current  window  and  its  history into the paste
     buffer. In this mode  a  vi-like  `full  screen  editor'  is
     active:
     The editor's movement keys are:

     allbox tab(@); l l.  T{ h, C-h,
     left arrow T}@move the cursor left.  T{ j, C-n,
     down arrow T}@move the cursor down.  T{ k, C-p,
     up arrow T}@move the cursor up.  T{ l ('el'),
     right arrow T}@move the cursor right.  0 (zero) C-a@move  to
     the  leftmost  column.   +  and  -@positions one line up and
     down.  H, M and L@T{ move the cursor to the leftmost  column
     of  the top, center or bottom line of the window. T} |@moves
     to the specified absolute column.  g or  home@moves  to  the
     beginning of the buffer.  G or end@T{ moves to the specified
     absolute line (default: end of buffer).  T} %@jumps  to  the
     specified  percentage  of the buffer.  ^ or $@T{ move to the
     leftmost column, to the first or last non-whitespace charac-
     ter  on  the  line.   T} w, b, and e@move the cursor word by
     word.  B, E@move the cursor WORD by WORD (as in  vi).   f/F,
     t/T@T{   move   the  cursor  forward/backward  to  the  next
     occurence of the target. (eg, `3fy' will move the cursor  to
     the  3rd  `y'  to the right.)  T} ; and ,@T{ Repeat the last
     f/F/t/T command in the same/opposite direction.  T} C-e  and
     C-y@T{ scroll the display up/down by one line while preserv-
     ing the cursor position.   T}  C-u  and  C-d@T{  scroll  the
     display  up/down  by  the  specified  amount  of lines while
     preserving the cursor position. (Default: half screen-full).
     T} C-b and C-f@scroll the display up/down a full screen.


     Note: Emacs style movement  keys  can  be  customized  by  a
     .screenrc  command.   (E.g. markkeys "h=^B:l=^F:$=^E") There
     is no simple method for a full emacs-style keymap,  as  this
     involves multi-character codes.

     Some keys are defined to do mark and replace operations.

     The copy range is specified by setting two marks.  The  text
     between these marks will be highlighted. Press:

          space or enter to set the first or second mark  respec-
          tively. If mousetrack is set to `on', marks can also be
          set using left mouse click.

          Y and y used to mark one whole line  or  to  mark  from
          start of line.

          W marks exactly one word.

     Any of these commands can be prefixed with  a  repeat  count
     number by pressing digits

          0..9 which is taken as a repeat count.

     Example: "C-a C-[ H 10 j 5 Y" will copy lines 11 to 15  into
     the paste buffer.

     The folllowing search keys are defined:

          / Vi-like search forward.

          ? Vi-like search backward.

          C-a s Emacs style incremental search forward.

          C-r Emacs style reverse i-search.
          n Find next search pattern.

          N Find previous search pattern.


     There are however some keys that act differently than in vi.
     Vi  does  not  allow one to yank rectangular blocks of text,
     but screen does. Press: c or C to set the left or right mar-
     gin  respectively. If no repeat count is given, both default
     to the current cursor position.

     Example: Try this on a rather full text screen:

          "C-a [ M 20 l SPACE c 10 l 5 j C SPACE".

     This moves one to the middle line of the screen, moves in 20
     columns  left, marks the beginning of the paste buffer, sets
     the left column,  moves  5  columns  down,  sets  the  right
     column, and then marks the end of the paste buffer. Now try:

          "C-a [ M 20 l SPACE 10 l 5 j SPACE"

     and notice the difference in the amount of text copied.

     J joins lines. It toggles between 4 modes:  lines  separated
     by  a  newline  character (012), lines glued seamless, lines
     separated by a single whitespace and comma separated  lines.
     Note  that you can prepend the newline character with a car-
     riage return character, by issuing a "crlf on".

     v or V is for all the vi users with ":set numbers" - it tog-
     gles the left margin between column 9 and 1. Press

     a before the final space key to toggle in append mode.  Thus
     the  contents  of  the paste buffer will not be overwritten,
     but is appended to.

     A toggles in append mode and sets a (second) mark.

     > sets the (second) mark and  writes  the  contents  of  the
     paste     buffer     to     the     screen-exchange     file
     (/tmp/screen-exchange per default) once  copy-mode  is  fin-
     ished.

     This example demonstrates how to dump the  whole  scrollback
     buffer to that file: "C-A [ g SPACE G $ >".

     C-g gives information about the current line and column.

     x or o exchanges the first mark and the current cursor posi-
     tion. You can use this to adjust an already placed mark.

     C-l ('el') will redraw the screen.

     @ does nothing. Does not even exit copy mode.

     All keys not described here exit copy mode.

     copy_reg [key]

     No longer exists, use "readreg" instead.

     crlf [on|off]

     This affects the copying of text regions with  the  `C-a  ['
     command.  If  it  is set to `on', lines will be separated by
     the two character sequence `CR' - `LF'. Otherwise  (default)
     only `LF' is used.  When no parameter is given, the state is
     toggled.

     debug on|off

     Turns runtime debugging on or off. If screen has  been  com-
     piled  with option -DDEBUG debugging available and is turned
     on per default. Note that this command only  affects  debug-
     ging  output from the main "SCREEN" process correctly. Debug
     output from attacher processes can only be turned  off  once
     and forever.

     defc1 on|off

     Same as the c1 command except that the default  setting  for
     new windows is changed. Initial setting is `on'.

     defautonuke on|off

     Same as the autonuke command except that the default setting
     for new displays is changed. Initial setting is `off'.  Note
     that you can use the special `AN' terminal capability if you
     want to have a dependency on the terminal type.

     defbce on|off

     Same as the bce command except that the default setting  for
     new windows is changed. Initial setting is `off'.

    defbreaktype [tcsendbreak|TIOCSBRK

     Choose one of the available methods of  generating  a  break
     signal  for  terminal  devices.  The  preferred  methods are
     tcsendbreak and TIOCSBRK.  The  third,  TCSBRK,  blocks  the
     complete  screen  session for the duration of the break, but
     it may be the only way to generate long breaks.  Tcsendbreak
     and  TIOCSBRK may or may not produce long breaks with spikes
     (e.g. 4 per second). This is not only system-dependent, this
     also   differs   between   serial  board  drivers.   Calling
     "defbreaktype" with no parameter displays the  current  set-
     ting.

     defcharset [set]

     Like the charset command except that the default setting for
     new  windows  is  changed.  Shows  current default if called
     without argument.

     defdynamictitle on|off

     Set default behaviour for new windows  regarding  if  screen
     should   change  window  title  when  seeing  proper  escape
     sequence. See also "TITLES (naming windows)" section.

     defescape xy

     Set the default command characters. This  is  equivalent  to
     the  "escape"  except  that  it is useful multiuser sessions
     only. In a multiuser session "escape"  changes  the  command
     character of the calling user, where "defescape" changes the
     default command characters for  users  that  will  be  added
     later.

     defflow on|off|auto

     Same as the flow command except that the default setting for
     new windows is changed. Initial setting is `auto'.  Specify-
     ing "defflow auto interrupt" is the same as the command-line
     options -fa and -i.

     defgr on|off

     Same as the gr command except that the default  setting  for
     new windows is changed. Initial setting is `off'.

     defhstatus [status]

     The hardstatus line that all new windows will get is set  to
     status.  This  command  is  useful to make the hardstatus of
     every window display the window number or title or the like.
     Status may contain the same directives as in the window mes-
     sages, but the directive escape  character  is  `^E'  (octal
     005) instead of `%'.  This was done to make a misinterpreta-
     tion of program generated hardstatus lines  impossible.   If
     the  parameter status is omitted, the current default string
     is displayed.  Per default the hardstatus line of  new  win-
     dows is empty.

     defencoding enc

     Same as the encoding command except that the default setting
     for  new windows is changed. Initial setting is the encoding
     taken from the terminal.

     deflog on|off

     Same as the log command except that the default setting  for
     new windows is changed. Initial setting is `off'.

     deflogin on|off

     Same as the login command except that  the  default  setting
     for new windows is changed. This is initialized with `on' as
     distributed (see config.h.in).

     defmode mode

     The mode of each newly allocated pseudo-tty is set to  mode.
     Mode  is  an  octal  number.   When  no "defmode" command is
     given, mode 0622 is used.

     defmonitor on|off

     Same as the monitor command except that the default  setting
     for new windows is changed. Initial setting is `off'.

     defmousetrack on|off

     Same as the mousetrack command except that the default  set-
     ting for new windows is changed. Initial setting is `off'.

     defnonblock on|off|numsecs

     Same as the nonblock command except that the default setting
     for displays is changed. Initial setting is `off'.

     defobuflimit limit

     Same as the obuflimit command except that the  default  set-
     ting  for  new  displays  is changed. Initial setting is 256
     bytes.  Note that you can  use  the  special  `OL'  terminal
     capability  if you want to have a dependency on the terminal
     type.

     defscrollback num

     Same as the scrollback command except that the default  set-
     ting for new windows is changed. Initial setting is 100.

     defshell command

     Synonym to the shell .screenrc command. See there.

     defsilence on|off

     Same as the silence command except that the default  setting
     for new windows is changed. Initial setting is `off'.

     defslowpaste msec

     Same as the slowpaste command except that the  default  set-
     ting  for  new windows is changed. Initial setting is 0 mil-
     liseconds, meaning `off'.

     defutf8 on|off

     Same as the utf8 command except that the default setting for
     new  windows  is  changed. Initial setting is `on' if screen
     was started with "-U", otherwise `off'.

     defwrap on|off

     Same as the wrap command except that the default setting for
     new windows is changed. Initially line-wrap is on and can be
     toggled with the "wrap" command ("C-a r")  or  by  means  of
     "C-a : wrap on|off".

     defwritelock on|off|auto

     Same as the writelock command except that the  default  set-
     ting  for  new windows is changed. Initially writelocks will
     off.

     detach [-h]

     Detach the screen session (disconnect it from  the  terminal
     and  put  it  into the background).  This returns you to the
     shell where you invoked screen.  A detached  screen  can  be
     resumed by invoking screen with the -r option (see also sec-
     tion "COMMAND-LINE OPTIONS"). The -h option tells screen  to
     immediately close the connection to the terminal ("hangup").

     dinfo

     Show what screen thinks about your terminal. Useful  if  you
     want  to know why features like color or the alternate char-
     set don't work.

     displays

     Shows a tabular listing  of  all  currently  connected  user
     front-ends  (displays).   This  is most useful for multiuser
     sessions.  The following keys can be used in displays list:
     allbox tab(@); l l.  k, C-p, or up@Move up one line.  j,  C-
     n,  or  down@Move  down  one  line.  C-a or home@Move to the
     first line.  C-e or end@Move to the last line.   C-u  or  C-
     d@Move  one  half page up or down.  C-b or C-f@Move one full
     page up or down.  mouseclick@T{ Move to the  selected  line.
     Available  when "mousetrack" is set to on.  T} space@Refresh
     the list d@Detach that display D@Power detach  that  display
     C-g, enter, or escape@Exit the list

     The following is an example of what  "displays"  could  look
     like:
          xterm 80x42 jnweiger@/dev/ttyp4     0(m11)   &rWx
          facit 80x24 mlschroe@/dev/ttyhf nb 11(tcsh)   rwx
          xterm 80x42 jnhollma@/dev/ttyp5     0(m11)   &R.x
           (A)   (B)     (C)     (D)     (E) (F)(G)   (H)(I)

     The legend is as follows:

          (A) The terminal type known by screen for this display.

     (B) Displays geometry as width x height.

     (C) Username who is logged in at the display.

     (D) Device name of the display or the attached device

     (E) Display is in blocking or nonblocking mode.  The  avail-
     able modes are "nb", "NB", "Z<", "Z>", and "BL".

     (F) Number of the window

     (G) Name/title of window

     (H) Whether the window is shared

     (I) Window permissions. Made up of three characters:

                (1st character)
                   ‘-’ : no read
                   ‘r’ : read
                   ‘R’ : read only due to foreign wlock
                (2nd character)
                   ‘-’ : no write
                   ‘.’ : write suppressed by foreign wlock
                   ‘w’ : write
                   ‘W’ : own wlock
                (3rd character)
                   ‘-’ : no execute
                   ‘x’ : execute
               "Displays" needs a region  size  of  at  least  10
               characters  wide and 5 characters high in order to
               display.

          digraph [preset[unicode-value]]

          This command prompts the user for a  digraph  sequence.
          The  next two characters typed are looked up in a buil-
          tin table and the resulting character  is  inserted  in
          the input stream. For example, if the user enters `a"',
          an a-umlaut will be inserted. If  the  first  character
          entered  is a 0 (zero), screen will treat the following
          characters (up to three) as an  octal  number  instead.
          The  optional argument preset is treated as user input,
          thus one can create an "umlaut" key.  For  example  the
          command  "bindkey  ^K  digraph `"'" enables the user to
          generate an a-umlaut by typing CTRL-K a.  When  a  non-
          zero  unicode-value  is  specified,  a  new  digraph is
          created with the specified preset. The digraph is unset
          if a zero value is provided for the unicode-value.

          dumptermcap

          Write the termcap entry for the virtual terminal optim-
          ized  for  the  currently  active  window  to  the file
          ".termcap" in the user's "$HOME/.screen" directory  (or
          wherever  screen  stores  its  sockets. See the "FILES"
          section below).  This termcap entry is identical to the
          value  of the environment variable $TERMCAP that is set
          up by screen for each window. For terminfo  based  sys-
          tems  you  will  need to run a converter like captoinfo
          and then compile the entry with tic.

          dynamictitle on|off

          Change behaviour for windows regarding if screen should
          change window title when seeing proper escape sequence.
          See also "TITLES (naming windows)" section.

          echo [-n] message

          The echo command may be used to annoy screen users with
          a `message of the day'. Typically installed in a global
          /local/etc/screenrc. The option "-n"  may  be  used  to
          suppress  the  line  feed.   See also "sleep".  Echo is
          also useful for online checking  of  environment  vari-
          ables.

          encoding enc [enc]

          Tell screen how  to  interpret  the  input/output.  The
          first argument sets the encoding of the current window.
          Each window  can  emulate  a  different  encoding.  The
          optional  second  parameter  overwrites the encoding of
          the connected terminal. It should never  be  needed  as
          screen  uses the locale setting to detect the encoding.

          There is also a  way  to  select  a  terminal  encoding
          depending  on  the  terminal  type  by  using  the "KJ"
          termcap entry.

          Supported encodings  are  eucJP,  SJIS,  eucKR,  eucCN,
          Big5,  GBK,  KOI8-R,  KOI8-U, CP1251, UTF-8, ISO8859-2,
          ISO8859-3, ISO8859-4, ISO8859-5, ISO8859-6,  ISO8859-7,
          ISO8859-8, ISO8859-9, ISO8859-10, ISO8859-15, jis.

          See also "defencoding", which changes the default  set-
          ting of a new window.

          escape xy

          Set the command character to x and the  character  gen-
          erating  a literal command character (by triggering the
          "meta" command) to y (similar to the -e option).   Each
          argument  is either a single character, a two-character
          sequence of the form "^x" (meaning "C-x"), a  backslash
          followed  by an octal number (specifying the ASCII code
          of the character), or a backslash followed by a  second
          character, such as "\^" or "\\".  The default is "^Aa".

          eval command1[command2 …]

          Parses and executes each argument as separate command.

          exec [[fdpat]newcommand [

          Run a unix subprocess (specified by an executable  path
          newcommand  and  its optional arguments) in the current
          window.  The   flow   of   data   between   newcommands
          stdin/stdout/stderr,  the process originally started in
          the window (let us call it  "application-process")  and
          screen  itself  (window)  is  controlled  by  the  file
          descriptor pattern fdpat.  This pattern is basically  a
          three character sequence representing stdin, stdout and
          stderr of newcommand.  A  dot  (.)  connects  the  file
          descriptor  to  screen.  An exclamation mark (!) causes
          the  file   descriptor   to   be   connected   to   the
          application-process.  A  colon (:) combines both.  User
          input will go to newcommand unless newcommand  receives
          the application-process' output (fdpats first character
          is `!' or `:') or a pipe symbol  (|)  is  added  (as  a
          fourth character) to the end of fdpat.

          Invoking `exec' without arguments shows name and  argu-
          ments  of the currently running subprocess in this win-
          dow. Only one subprocess a time can be running in  each
          window.

          When a subprocess is running the  `kill'  command  will
          affect it instead of the windows process.

          Refer to  the  postscript  file  `doc/fdpat.ps'  for  a
          confusing illustration of all 21 possible combinations.
          Each drawing shows the digits  2,1,0  representing  the
          three  file  descriptors  of newcommand. The box marked
          `W' is the usual pty that has  the  application-process
          on its slave side.  The box marked `P' is the secondary
          pty that now has screen at its master side.

          Abbreviations: Whitespace between the word  `exec'  and
          fdpat and the command can be omitted. Trailing dots and
          a fdpat consisting only of dots can be omitted. A  sim-
          ple  `|' is synonymous for the pattern `!..|'; the word
          exec can be omitted here and can always be replaced  by
          `!'.

          Examples:

               exec … /bin/sh

               exec /bin/sh

               !/bin/sh

                    Creates another shell  in  the  same  window,
                    while  the  original  shell is still running.
                    Output of both shells is displayed  and  user
                    input is sent to the new /bin/sh.

               exec !.. stty 19200

               exec ! stty 19200

               !!stty 19200

                    Set the speed of the window's  tty.  If  your
                    stty  command  operates  on  stdout, then add
                    another `!'.

               exec !..| less

               |less

                    This adds a pager to the window  output.  The
                    special  character  `|' is needed to give the
                    user control over the pager although it  gets
                    its  input  from  the  window's process. This
                    works, because  less  listens  on  stderr  (a
                    behavior that screen would not expect without
                    the `|') when its stdin is not  a  tty.  Less
                    versions  newer than 177 fail miserably here;
                    good old pg still works.

               !:sed -n s/.*Error.*/\007/p

                    Sends window output to both, the user and the
                    sed  command.  The  sed inserts an additional
                    bell character (oct. 007) to the window  out-
                    put seen by screen.  This will cause "Bell in
                    window  x"  messages,  whenever  the   string
                    "Error" appears in the window.

          fit

          Change the window size  to  the  size  of  the  current
          region.  This  command is needed because screen doesn't
          adapt the window size automatically if  the  window  is
          displayed more than once.

          flow [on|off|auto]

          Sets the flow-control mode for  this  window.   Without
          parameters  it cycles the current window's flow-control
          setting from "automatic" to "on"  to  "off".   See  the
          discussion  on "FLOW-CONTROL" later on in this document
          for full details and note,  that  this  is  subject  to
          change  in  future  releases.   Default is set by `def-
          flow'.

          focus [next|prev|up|down|left|right|top|bottom]

          Move the input focus to the next region. This  is  done
          in a cyclic way so that the top left region is selected
          after the bottom right one. If no option  is  given  it
          defaults  to  `next'. The next region to be selected is
          determined by how the regions are  layered.   Normally,
          the  next  region  in the same layer would be selected.
          However, if that  next  region  contains  one  or  more
          layers,  the  first  region  in  the  highest  layer is
          selected first. If you are at the last  region  of  the
          current  layer,  `next' will move the focus to the next
          region in the lower layer (if there is a lower  layer).
          `Prev'  cycles  in  the opposite order. See "split" for
          more information about layers.

          The rest of the options (`up', `down', `left', `right',
          `top',  and  `bottom')  are more indifferent to layers.
          The option `up' will  move  the  focus  upward  to  the
          region  that  is  touching the upper left corner of the
          current region.   `Down'  will  move  downward  to  the
          region  that  is  touching the lower left corner of the
          current region. The option `left' will move  the  focus
          leftward  to the region that is touching the upper left
          corner of the current region, while `right'  will  move
          rightward  to  the  region  that  is touching the upper
          right corner of the current region. Moving left from  a
          left  most  region  or  moving  right from a right most
          region will result in no action.

          The option `top' will move the focus to the very  first
          region  in  the  upper  list  corner of the screen, and
          `bottom' will move to the region in  the  bottom  right
          corner  of the screen. Moving up from a top most region
          or moving down from a bottom most region will result in
          no action.

          Useful bindings are (h, j, k, and l as in vi)
              bind h focus left
              bind j focus down
              bind k focus up
              bind l focus right
              bind t focus top
              bind b focus bottom
          Note that k is traditionally bound to the kill command.

          focusminsize [ ( width|max|_ ) ( height|max|_ ) ]

          This  forces  any  currently  selected  region  to   be
          automatically  resized  at  least  a  certain width and
          height. All other surrounding regions will  be  resized
          in  order  to  accommodate.   This  constraint  follows
          everytime the "focus" command  is  used.  The  "resize"
          command  can  be used to increase either dimension of a
          region, but never below what  is  set  with  "focusmin-
          size". The underscore `_' is a synonym for max. Setting
          a width and height of `0 0' (zero zero) will  undo  any
          constraints and allow for manual resizing.  Without any
          parameters, the minimum width and height is shown.

          gr [on|off]

          Turn GR charset switching on/off. Whenever screen  sees
          an  input  character  with the 8th bit set, it will use
          the charset stored in the GR slot and print the charac-
          ter  with  the  8th bit stripped. The default (see also
          "defgr") is not to process GR switching because  other-
          wise the ISO88591 charset would not work.

          group [grouptitle]

          Change or show the group the current window belongs to.
          Windows can be moved around between different groups by
          specifying the name of the destination  group.  Without
          specifying  a  group, the title of the current group is
          displayed.

          hardcopy [-h] [file]

          Writes out the currently displayed image  to  the  file
          file, or, if no filename is specified, to hardcopy.n in
          the default directory, where n is  the  number  of  the
          current  window.  This either appends or overwrites the
          file if it exists. See below.   If  the  option  -h  is
          specified,  dump  also  the  contents of the scrollback
          buffer.

          hardcopy_append on|off

          If set to "on", screen will append to the  "hardcopy.n"
          files  created  by the command "C-a h", otherwise these
          files are overwritten each time.  Default is `off'.

          hardcopydir directory

          Defines  a  directory  where  hardcopy  files  will  be
          placed.  If  unset,  hardcopys  are  dumped in screen's
          current working directory.

          hardstatus [on|off]

         hardstatus [always]firstline|lastline|message

          hardstatus string[string]

          This command configures the use and  emulation  of  the
          terminal's  hardstatus  line.  The  first  form toggles
          whether screen will use the  hardware  status  line  to
          display  messages.  If  the flag is set to `off', these
          messages are overlaid in  reverse  video  mode  at  the
          display line. The default setting is `on'.

          The second form tells screen what to do if the terminal
          doesn't    have    a    hardstatus   line   (i.e.   the
          termcap/terminfo capabilities "hs", "ts", "fs" and "ds"
          are  not  set).   When  "firstline/lastline"  is  used,
          screen will reserve the first/last line of the  display
          for  the  hardstatus.  "message"  uses screen's message
          mechanism and "ignore" tells screen  never  to  display
          the  hardstatus.   If  you prepend the word "always" to
          the type (e.g., "alwayslastline"), screen will use  the
          type even if the terminal supports a hardstatus.

          The third form specifies the contents of the hardstatus
          line.  `%h' is used as default string, i.e., the stored
          hardstatus  of  the  current   window   (settable   via
          "ESC]0;<string>^G" or "ESC_<string>ESC\") is displayed.

          You can customize this to any string you like including
          the  escapes  from the "STRING ESCAPES" chapter. If you
          leave out the argument string, the  current  string  is
          displayed.

          You can mix the second and third form by providing  the
          string as additional argument.

          height [-w|-d] [

          Set the display height to a specified number of  lines.
          When  no argument is given it toggles between 24 and 42
          lines display. You can also specify a width if you want
          to  change  both values.  The -w option tells screen to
          leave the display size unchanged and just set the  win-
          dow size, -d vice versa.

          help[class]

          Not really a online help, but displays  a  help  screen
          showing you all the key bindings.  The first pages list
          all the internal commands  followed  by  their  current
          bindings.   Subsequent  pages  will  display the custom
          commands, one command per key.  Press space when you're
          done  reading  each page, or return to exit early.  All
          other characters are ignored. If  the  "-c"  option  is
          given,  display  all  bound  commands for the specified
          command class.  See also "DEFAULT  KEY  BINDINGS"  sec-
          tion.

          history

          Usually users work with a shell that allows easy access
          to  previous commands.  For example csh has the command
          "!!" to repeat the last command executed. Screen allows
          you  to have a primitive way of re-calling "the command
          that started …": You just type the  first  letter  of
          that command, then hit `C-a {' and screen tries to find
          a previous line that matches with the  `prompt  charac-
          ter'  to  the  left  of the cursor. This line is pasted
          into this window's input queue.  Thus you have a  crude
          command  history (made up by the visible window and its
          scrollback buffer).

          hstatus status

          Change the  window's  hardstatus  line  to  the  string
          status.

          idle [timeout[cmd-args]]

          Sets a command that is run after the  specified  number
          of  seconds  inactivity  is  reached. This command will
          normally be the "blanker" command to  create  a  screen
          blanker,  but it can be any screen command.  If no com-
          mand is specified, only the timeout is set.  A  timeout
          of  zero  (or  the  special  timeout  off) disables the
          timer.  If no arguments are given, the current settings
          are displayed.

          ignorecase [on|off]

          Tell  screen  to  ignore  the  case  of  characters  in
          searches.  Default  is  `off'. Without any options, the
          state of ignorecase is toggled.

          info

          Uses the message line to display some information about
          the  current  window:   the cursor position in the form
          "(column,row)"  starting  with  "(1,1)",  the  terminal
          width and height plus the size of the scrollback buffer
          in lines, like in "(80,24)+50", the  current  state  of
          window  XON/XOFF  flow  control is shown like this (See
          also section FLOW CONTROL):

            +flow     automatic flow control, currently on.
            -flow     automatic flow control, currently off.
            +(+)flow  flow control enabled. Agrees with automatic control.
            -(+)flow  flow control disabled. Disagrees with automatic control.
            +(-)flow  flow control enabled. Disagrees with automatic control.
            -(-)flow  flow control disabled. Agrees with automatic control.

          The  current  line  wrap  setting  (`+wrap'   indicates
          enabled,  `-wrap'  not) is also shown. The flags `ins',
          `org', `app', `log', `mon'  or  `nored'  are  displayed
          when  the  window  is  in  insert  mode,  origin  mode,
          application-keypad mode, has output  logging,  activity
          monitoring or partial redraw enabled.

          The currently active character set (G0, G1, G2, or  G3)
          and in square brackets the terminal character sets that
          are currently designated as G0 through G3 is shown.  If
          the  window  is  in  UTF-8  mode, the string "UTF-8" is
          shown instead.

          Additional modes depending on the type  of  the  window
          are  displayed  at the end of the status line (See also
          chapter "WINDOW TYPES").

          If the state machine of the terminal emulator is  in  a
          non-default  state,  the  info  line  is started with a
          string identifying the current state.

          For system information use the "time" command.

          ins_reg [key]

          No longer exists, use "paste" instead.

          kill

          Kill current window.

          If there is  an  `exec'  command  running  then  it  is
          killed.  Otherwise  the  process (shell) running in the
          window receives a HANGUP condition, the  window  struc-
          ture  is  removed and screen (your display) switches to
          another window.  When the  last  window  is  destroyed,
          screen exits.  After a kill screen switches to the pre-
          viously displayed window.

          Note:  Emacs users should keep this  command  in  mind,
          when  killing a line.  It is recommended not to use "C-
          a" as the screen escape key or to rebind kill  to  "C-a
          K".

          lastmsg

          Redisplay the last contents of the message/status line.
          Useful if you're typing when a message appears, because
          the message goes away when you press a key (unless your
          terminal  has  a  hardware  status line).  Refer to the
          commands "msgwait" and "msgminwait" for fine tuning.

          layout new [title]

          Create a new layout. The  screen  will  change  to  one
          whole  region and be switched to the blank window. From
          here, you build the regions and the windows  they  show
          as you desire. The new layout will be numbered with the
          smallest available integer, starting with zero. You can
          optionally give a title to your new layout.  Otherwise,
          it will have a  default  title  of  "layout".  You  can
          always change the title later by using the command lay-
          out title.

          layout remove [n|title]

          Remove, or in other words, delete the specified layout.
          Either  the  number  or  the  title  can  be specified.
          Without either specification, screen  will  remove  the
          current layout.

          Removing a layout does not affect your set  windows  or
          regions.
          layout next

          Switch to the next layout available

          layout prev

          Switch to the previous layout available

          layout select [n|title]

          Select the desired layout. Either  the  number  or  the
          title  can  be specified. Without either specification,
          screen will prompt and ask which screen is desired.  To
          see  which  layouts  are available, use the layout show
          command.

          layout show

          List on the message line the number(s) and title(s)  of
          the available layout(s). The current layout is flagged.

          layout title [title]

          Change or display the title of the  current  layout.  A
          string  given  will be used to name the layout. Without
          any options, the current title and number is  displayed
          on the message line.

          layout number [n]

          Change or display the number of the current layout.  An
          integer  given  will  be  used  to  number  the layout.
          Without any options, the current number  and  title  is
          displayed on the message line.

          layout attach [title|:last]

          Change or display which layout to reattach back to. The
          default  is  :last, which tells screen to reattach back
          to the last used layout just before detachment. By sup-
          plying  a title, You can instruct screen to reattach to
          a particular layout regardless which one  was  used  at
          the time of detachment. Without any options, the layout
          to reattach to will be shown in the message line.

          layout save [n|title]

          Remember the current arrangement of regions. When used,
          screen  will remember the arrangement of vertically and
          horizontally  split  regions.   This   arrangement   is
          restored   when  a  screen  session  is  reattached  or
          switched back from a different layout. If  the  session
          ends  or  the  screen process dies, the layout arrange-
          ments are lost. The layout dump command should help  in
          this  siutation.  If  a  number  or  title is supplied,
          screen will remember the arrangement of that particular
          layout.  Without  any options, screen will remember the
          current layout.

          Saving your regions can be done automatically by  using
          the layout autosave command.

          layout autosave [on|off]

          Change or display the  status  of  automatcally  saving
          layouts.  The  default  is  on,  meaning when screen is
          detached or changed to a different layout, the arrange-
          ment  of  regions and windows will be remembered at the
          time of change and restored upon return.   If  autosave
          is  set  to off, that arrangement will only be restored
          to either to the last manual save, using  layout  save,
          or  to  when  the layout was first created, to a single
          region with a single window. Without either  an  on  or
          off,  the  current  status  is displayed on the message
          line.

          layout dump [filename]

          Write to a file the order of splits made in the current
          layout.  This  is  useful to recreate the order of your
          regions used in your current layout. Only  the  current
          layout  is recorded. While the order of the regions are
          recorded, the sizes of those regions and which  windows
          correspond  to which regions are not. If no filename is
          specified, the default is  layout-dump,  saved  in  the
          directory  that  the  screen process was started in. If
          the file already exists, layout  dump  will  append  to
          that file. As an example:

                      C-a : layout dump /home/user/.screenrc

          will save or append the layout to the user's  .screenrc
          file.

          license

          Display the disclaimer  page.  This  is  done  whenever
          screen  is  started  without  options,  which should be
          often enough. See also the "startup_message" command.

          lockscreen

          Lock  this  display.    Call   a   screenlock   program
          (/local/bin/lck  or  /usr/bin/lock  or  a builtin if no
          other is available). Screen does not accept any command
          keys until this program terminates. Meanwhile processes
          in the windows may continue, as the windows are in  the
          `detached' state. The screenlock program may be changed
          through the environment variable $LOCKPRG  (which  must
          be  set  in the shell from which screen is started) and
          is executed with the user's uid and gid.

          Warning: When you leave other shells unlocked  and  you
          have  no  password set on screen, the lock is void: One
          could easily re-attach from  an  unlocked  shell.  This
          feature should rather be called `lockterminal'.

          log [on|off]

          Start/stop writing output of the current  window  to  a
          file  "screenlog.n"  in the window's default directory,
          where n is the  number  of  the  current  window.  This
          filename  can be changed with the `logfile' command. If
          no parameter is given, the state of logging is toggled.
          The session log is appended to the previous contents of
          the file if it already exists. The current contents and
          the contents of the scrollback history are not included
          in the session log.  Default is `off'.

          logfile filename

          logfile flush secs

          Defines the name the log files will get. The default is
          "screenlog.%n".  The  second form changes the number of
          seconds screen will wait before  flushing  the  logfile
          buffer  to  the  file-system.  The  default value is 10
          seconds.

          login [on|off]

          Adds or removes the entry in the utmp database file for
          the  current  window.   This  controls if the window is
          `logged in'.  When no parameter  is  given,  the  login
          state  of  the window is toggled.  Additionally to that
          toggle, it is convenient having a `log in' and  a  `log
          out' key. E.g. `bind I login on' and `bind O login off'
          will map these keys to be C-a I and C-a O.  The default
          setting  (in  config.h.in)  should be "on" for a screen
          that runs under suid-root.  Use the "deflogin"  command
          to change the default login state for new windows. Both
          commands are only present when screen has been compiled
          with utmp support.

          logtstamp [on|off]
          logtstamp after [secs]

          logtstamp string
          [string]

          This command controls logfile time-stamp  mechanism  of
          screen.  If  time-stamps are turned "on", screen adds a
          string containing the current time to the logfile after
          two  minutes  of inactivity.  When output continues and
          more than another two minutes  have  passed,  a  second
          time-stamp is added to document the restart of the out-
          put. You can change this timeout with the  second  form
          of  the command. The third form is used for customizing
          the time-stamp  string  (`--  %n:%t  --  time-stamp  --
          %M/%d/%y %c:%s --\n' by default).

          mapdefault

          Tell screen that the next input character  should  only
          be  looked  up  in  the default bindkey table. See also
          "bindkey".

          mapnotnext

          Like mapdefault, but don't even  look  in  the  default
          bindkey table.

          maptimeout [timeout]

          Set the inter-character timer for input sequence detec-
          tion to a timeout of timeout ms. The default timeout is
          300ms. Maptimeout with no arguments shows  the  current
          setting.  See also "bindkey".

          markkeys string

          This is a  method  of  changing  the  keymap  used  for
          copy/history   mode.    The   string   is  made  up  of
          oldchar=newchar pairs which are separated by `:'. Exam-
          ple:  The string "B=^B:F=^F" will change the keys `C-b'
          and `C-f' to the vi style binding (scroll up/down  fill
          page).   This happens to be the default binding for `B'
          and `F'.  The command "markkeys  h=^B:l=^F:$=^E"  would
          set  the mode for an emacs-style binding.  If your ter-
          minal sends characters, that cause you  to  abort  copy
          mode, then this command may help by binding these char-
          acters to do nothing.  The no-op character is  `@'  and
          is  used like this: "markkeys @=L=H" if you do not want
          to use the `H' or `L' commands any longer.  As shown in
          this  example,  multiple  keys  can  be assigned to one
          function in a single statement.
          maxwin num

          Set the  maximum  window  number  screen  will  create.
          Doesn't affect already existing windows. The number can
          be increased only when there are no existing windows.

          meta

          Insert the  command  character  (C-a)  in  the  current
          window's input stream.

          monitor [on|off]

          Toggles activity monitoring of windows.  When  monitor-
          ing  is  turned  on  and an affected window is switched
          into the background,  you  will  receive  the  activity
          notification  message  in  the status line at the first
          sign of output and the window will also be marked  with
          an  `@'  in  the  window-status display.  Monitoring is
          initially off for all windows.

          mousetrack [on|off]

          This command determines whether screen will  watch  for
          mouse  clicks.  When  this  command is enabled, regions
          that have been split in various ways can be selected by
          pointing  to  them with a mouse and left-clicking them.
          Without specifying on or  off,  the  current  state  is
          displayed. The default state is determined by the "def-
          mousetrack" command.

          msgminwait sec

          Defines the time screen delays a new message  when  one
          message  is  currently  displayed.  The  default  is  1
          second.

          msgwait sec

          Defines the time a message is displayed  if  screen  is
          not  disturbed  by  other  activity.  The  default is 5
          seconds.

          multiuser on|off

          Switch between singleuser and multiuser mode.  Standard
          screen  operation  is singleuser. In multiuser mode the
          commands `acladd', `aclchg', `aclgrp' and `acldel'  can
          be  used  to enable (and disable) other users accessing
          this screen session.

          nethack on|off

          Changes the kind of  error  messages  used  by  screen.
          When  you are familiar with the game "nethack", you may
          enjoy the nethack-style messages which will often  blur
          the  facts a little, but are much funnier to read. Any-
          way, standard messages often  tend  to  be  unclear  as
          well.
          This option is only available if  screen  was  compiled
          with  the  NETHACK flag defined. The default setting is
          then determined by  the  presence  of  the  environment
          variable $NETHACKOPTIONS and the file ~/.nethackrc - if
          either one is present, the default is on.

          next

          Switch to the next window.  This command  can  be  used
          repeatedly to cycle through the list of windows.

          nonblock
               [on|off|numsecs

          Tell screen how to deal with user interfaces (displays)
          that  cease to accept output. This can happen if a user
          presses ^S or a TCP/modem connection gets  cut  but  no
          hangup  is  received.  If  nonblock is off (this is the
          default) screen waits until  the  display  restarts  to
          accept  the  output.  If  nonblock  is on, screen waits
          until the timeout is reached (on is treated as 1s).  If
          the  display  still  doesn't receive characters, screen
          will consider it "blocked" and stop sending  characters
          to  it.  If  at some time it restarts to accept charac-
          ters, screen will unblock the display and redisplay the
          updated window contents.

          number [[+|-]n]

          Change the current window's number. If the given number
          n  is  already  used  by  another  window, both windows
          exchange their numbers. If no  argument  is  specified,
          the  current  window number (and title) is shown. Using
          `+' or `-' will change the window's number by the rela-
          tive amount specified.

          obuflimit [limit]

          If the output  buffer  contains  more  bytes  than  the
          specified  limit,  no  more  data will be read from the
          windows. The default value is 256. If you have  a  fast
          display  (like  xterm),  you  can set it to some higher
          value. If no argument is specified, the current setting
          is displayed.

          only

          Kill all regions but the current one.

          other

          Switch to the window displayed previously. If this win-
          dow  does no longer exist, other has the same effect as
          next.

          partial on|off

          Defines whether the display  should  be  refreshed  (as
          with  redisplay) after switching to the current window.
          This command  only  affects  the  current  window.   To
          immediately  affect all windows use the allpartial com-
          mand.  Default is `off', of course.   This  default  is
          fixed, as there is currently no defpartial command.

          password [crypted_pw]

          Present a crypted password in your ".screenrc" file and
          screen  will  ask  for it, whenever someone attempts to
          resume  a  detached.  This  is  useful  if   you   have
          privileged  programs  running under screen and you want
          to protect  your  session  from  reattach  attempts  by
          another   user  masquerading  as  your  uid  (i.e.  any
          superuser.)   If  no  crypted  password  is  specified,
          screen  prompts  twice for typing a password and places
          its encryption in the paste buffer.  Default is `none',
          this disables password checking.

          paste [registers [dest_reg]]

          Write the  (concatenated)  contents  of  the  specified
          registers to the stdin queue of the current window. The
          register `.' is treated as  the  paste  buffer.  If  no
          parameter  is  given  the user is prompted for a single
          register to paste.  The paste buffer can be filled with
          the copy, history and readbuf commands. Other registers
          can be filled with the register, readreg and paste com-
          mands.   If paste is called with a second argument, the
          contents of the specified registers is pasted into  the
          named  destination  register rather than the window. If
          `.' is used as the second argument, the displays  paste
          buffer  is  the destination.  Note, that "paste" uses a
          wide variety of resources: Whenever a  second  argument
          is  specified  no  current  window  is needed. When the
          source specification only contains registers  (not  the
          paste  buffer) then there need not be a current display
          (terminal attached), as  the  registers  are  a  global
          resource. The paste buffer exists once for every user.

          pastefont [on|off]

          Tell screen to include font information  in  the  paste
          buffer.  The  default  is not to do so. This command is
          especially useful for multi character fonts like kanji.

          pow_break

          Reopen the window's terminal line and send a break con-
          dition. See `break'.

          pow_detach

          Power detach. Mainly the same as detach, but also sends
          a  HANGUP signal to the parent process of screen.  CAU-
          TION: This will result in a  logout,  when  screen  was
          started from your login-shell.

          pow_detach_msg [message]

          The message specified here is output whenever a  `Power
          detach'  was performed. It may be used as a replacement
          for a logout  message  or  to  reset  baud  rate,  etc.
          Without parameter, the current message is shown.

          prev

          Switch to the window with the next lower number.   This
          command  can  be  used  repeatedly to cycle through the
          list of windows.

          printcmd [cmd]

          If cmd is not an empty string, screen will not use  the
          terminal  capabilities  "po/pf"  if  it detects an ansi
          print sequence ESC [ 5 i, but pipe the output into cmd.
          This should normally be a command like "lpr" or "'cat >
          /tmp/scrprint'".  printcmd without a  command  displays
          the  current  setting.   The  ansi  sequence ESC \ ends
          printing and closes the pipe.

          Warning: Be careful with this command!  If  other  user
          have  write  access to your terminal, they will be able
          to fire off print commands.

          process [key]

          Stuff the  contents  of  the  specified  register  into
          screen's  input  queue. If no argument is given you are
          prompted for a register name. The text is parsed as  if
          it  had  been  typed  in from the user's keyboard. This
          command can be used to bind multiple actions to a  sin-
          gle key.
          quit

          Kill all windows and terminate screen.   Note  that  on
          VT100-style  terminals the keys C-4 and C-\ are identi-
          cal.  This makes the default  bindings  dangerous:   Be
          careful  not  to type C-a C-4 when selecting window no.
          4.  Use the empty bind command (as in "bind  `^\'")  to
          remove a key binding.

          readbuf [encoding] [filename]

          Reads the contents of the specified file into the paste
          buffer.   You  can tell screen the encoding of the file
          via the -e  option.   If  no  file  is  specified,  the
          screen-exchange  filename  is  used.  See also "buffer-
          file" command.

          readreg [encoding] [register [

          Does one of two things, dependent on  number  of  argu-
          ments:  with zero or one arguments it it duplicates the
          paste buffer contents into the  register  specified  or
          entered  at the prompt. With two arguments it reads the
          contents of the named file into the register,  just  as
          readbuf  reads  the screen-exchange file into the paste
          buffer.  You can tell screen the encoding of  the  file
          via  the  -e  option.  The following example will paste
          the system's  password  file  into  the  screen  window
          (using register p, where a copy remains):

                      C-a : readreg p /etc/passwd
          C-a : paste p

          redisplay

          Redisplay the current window.  Needed  to  get  a  full
          redisplay when in partial redraw mode.

          register [-eencoding]key-string

          Save the specified string to  the  register  key.   The
          encoding  of  the  string  can  be specified via the -e
          option.  See also the "paste" command.

          remove

          Kill the current region. This is a no-op  if  there  is
          only one region.

          removebuf

          Unlinks the screen-exchange file used by  the  commands
          "writebuf" and "readbuf".

         rendition bell | monitor | silence |

          Change the way screen renders  the  titles  of  windows
          that  have  monitor  or  bell  flags  set in caption or
          hardstatus or  windowlist.  See  the  "STRING  ESCAPES"
          chapter  for  the syntax of the modifiers.  The default
          for monitor is currently "=b " (bold,  active  colors),
          for  bell  "=ub  " (underline, bold and active colors),
          and "=u " for silence.

          reset

          Reset the virtual terminal to  its  "power-on"  values.
          Useful  when  strange  settings (like scroll regions or
          graphics character set) are left over from an  applica-
          tion.

          resize
               [-h|-v|-b [[+|-] n[%] |=|max|min

          Resize the current region. The space  will  be  removed
          from  or  added to the surrounding regions depending on
          the order of the splits.   The  available  options  for
          resizing   are   `-h'(horizontal),  `-v'(vertical),  `-
          b'(both),    `-l'(local    to    layer),     and     `-
          p'(perpendicular).   Horizontal  resizes  will  add  or
          remove width to a region, vertical will add  or  remove
          height,  and  both  will  add  or remove size from both
          dimensions. Local and perpendicular are similar to hor-
          izontal and vertical, but they take in account of how a
          region was split.  If a region's last  split  was  hor-
          izontal,  a  local  resize  will  work  like a vertical
          resize. If a region's last split was vertical, a  local
          resize  will work like a horizontal resize. Perpendicu-
          lar resizes work in opposite of local  resizes.  If  no
          option is specified, local is the default.

          The amount of lines to add or remove can be expressed a
          couple  of  different ways. By specifying a number n by
          itself will resize the region by that absolute  amount.
          You  can  specify a relative amount by prefixing a plus
          `+' or minus `-' to the amount, such as adding +n lines
          or removing -n lines. Resizing can also be expressed as
          an absolute or relative percentage by postfixing a per-
          cent  sign  `%'.  Using zero `0' is a synonym for `min'
          and using an underscore `_' is a synonym for `max'.

          Some examples are:
          resize +N
               increase current region by N

          resize -N
               decrease current region by N

          resize  N
               set current region to N

          resize 20%
               set current region to 20% of original size

          resize +20%
               increase current region by 20%

          resize -b =
               make all windows equally

          resize  max
               maximize current region

          resize  min
               minimize current region

          Without any arguments, screen will prompt for  how  you
          would like to resize the current region.

          See "focusminsize" if you want to restrict the  minimun
          size a region can have.

     screen [-opts] [n] [cmd [args]|//group]

     Establish a new window.  The flow-control options  (-f,  -fn
     and  -fa), title (a.k.a.) option (-t), login options (-l and
     -ln)  ,  terminal  type  option  (-T   <term>),   the   all-
     capability-flag (-a) and scrollback option (-h <num>) may be
     specified with each command.  The option (-M) turns monitor-
     ing  on  for this window.  The option (-L) turns output log-
     ging on for this window.  If an optional  number  n  in  the
     range  0..MAXWIN-1 is given, the window number n is assigned
     to the newly created window (or, if this number  is  already
     in-use,  the next available number).  If a command is speci-
     fied after "screen", this command (with the given arguments)
     is started in the window; otherwise, a shell is created.  If
     //group is supplied, a container-type window is  created  in
     which other windows may be created inside it.

     Thus, if your ".screenrc" contains the lines

                 # example for .screenrc:
                 screen 1
                 screen -fn -t foobar -L 2 telnet foobar

     screen creates a shell window (in window #1)  and  a  window
     with  a  TELNET  connection  to  the machine foobar (with no
     flow-control using the title "foobar" in window #2) and will
     write  a  logfile  ("screenlog.2")  of  the  telnet session.
     Note, that unlike previous versions of screen no  additional
     default   window  is  created  when  "screen"  commands  are
     included in your ".screenrc" file. When  the  initialization
     is  completed,  screen switches to the last window specified
     in your .screenrc file or, if none, opens a  default  window
     #0.

     Screen has built in some functionality of "cu" and "telnet".
     See also chapter "WINDOW TYPES".

     scrollback num

     Set the size of the scrollback buffer for the  current  win-
     dows to num lines. The default scrollback is 100 lines.  See
     also the "defscrollback" command and use "info" to view  the
     current  setting.  To  access  and  use  the contents in the
     scrollback buffer, use the "copy" command.

     select [WindowID]

     Switch to the window identified by WindowID.  This can be  a
     prefix  of  a  window  title (alphanumeric window name) or a
     window number.  The parameter is optional  and  if  omitted,
     you  get  prompted  for  an identifier. When a new window is
     established, the first available number is assigned to  this
     window.   Thus, the first window can be activated by "select
     0".  The number of windows is limited at compile-time by the
     MAXWIN  configuration  parameter  (which  defaults  to  40).
     There are two special WindowIDs, "-"  selects  the  internal
     blank  window and "." selects the current window. The latter
     is useful if used with screen's "-X" option.

     sessionname [name]

     Rename the current session. Note, that  for  "screen  -list"
     the  name  shows  up  with  the process-id prepended. If the
     argument "name" is omitted, the  name  of  this  session  is
     displayed.  Caution:  The  $STY  environment  variables will
     still reflect the old name in pre-existing shells. This  may
     result  in  confusion.  Use  of  this  command  is generally
     discouraged. Use the "-S" command-line option if you want to
     name a new session.  The default is constructed from the tty
     and host names.

     setenv [var [string]]

     Set the environment variable var to value string.   If  only
     var  is  specified,  the  user  will  be prompted to enter a
     value.  If no parameters are specified,  the  user  will  be
     prompted  for  both  variable  and value. The environment is
     inherited by all subsequently forked shells.

     setsid [on|off]

     Normally screen uses different sessions and  process  groups
     for  the  windows. If setsid is turned off, this is not done
     anymore and all windows will be in the same process group as
     the screen backend process. This also breaks job-control, so
     be careful.  The default is on, of course. This  command  is
     probably useful only in rare circumstances.

     shell command

     Set the command to be used to  create  a  new  shell.   This
     overrides  the  value  of  the  environment variable $SHELL.
     This is useful if you'd like to run a tty-enhancer which  is
     expecting to execute the program specified in $SHELL. If the
     command begins with a  `-'  character,  the  shell  will  be
     started  as  a  login-shell.  Typical shells do only minimal
     initialization when not started as a login-shell.  E.g. Bash
     will not read your "~/.bashrc" unless it is a login-shell.

     shelltitle title

     Set the title for all shells created during  startup  or  by
     the C-A C-c command.  For details about what a title is, see
     the discussion entitled "TITLES (naming windows)".

     silence [on|off|sec]

     Toggles silence monitoring  of  windows.   When  silence  is
     turned  on and an affected window is switched into the back-
     ground, you will receive the silence notification message in
     the  status  line  after  a  specified  period of inactivity
     (silence). The default  timeout  can  be  changed  with  the
     `silencewait'  command  or by specifying a number of seconds
     instead of `on' or `off'.  Silence is initially off for  all
     windows.

     silencewait sec

     Define the time  that  all  windows  monitored  for  silence
     should wait before displaying a message. Default 30 seconds.

     sleep num

     This command will pause the execution of  a  .screenrc  file
     for  num seconds.  Keyboard activity will end the sleep.  It
     may be used to give users a chance to read the messages out-
     put by "echo".
     slowpaste msec

     Define the speed at which text is inserted into the  current
     window  by  the  paste  ("C-a  ]") command. If the slowpaste
     value is nonzero text is  written  character  by  character.
     screen  will  make  a  pause of msec milliseconds after each
     single character write to allow the application  to  process
     its  input.  Only  use  slowpaste  if your underlying system
     exposes flow control problems while pasting large amounts of
     text.

     sort

     Sort the windows in alphabetical order of the window tiles.

     source file

     Read and execute commands from file  file.  Source  commands
     may  be  nested to a maximum recursion level of ten. If file
     is not an absolute path and screen is already  processing  a
     source  command,  the parent directory of the running source
     command file is used to search  for  the  new  command  file
     before screen's current directory.

     Note that termcap/terminfo/termcapinfo commands only work at
     startup  and  reattach time, so they must be reached via the
     default screenrc files to have an effect.

     sorendition [attr[color]]

     This command is deprecated. See "rendition so" instead.

     split[-v]

     Split the current region into two new ones. All  regions  on
     the display are resized to make room for the new region. The
     blank window is displayed in the new region. The default  is
     to create a horizontal split, putting the new regions on the
     top and bottom of each other. Using `-v' will create a vert-
     ical  split,  causing the new regions to appear side by side
     of each other.  Use the "remove" or the  "only"  command  to
     delete regions.  Use "focus" to toggle between regions.

     When a region is split opposite of  how  it  was  previously
     split  (that is, vertical then horizontal or horizontal then
     vertical), a new layer is created.  The  layer  is  used  to
     group  together  the  regions  that are split the same. Nor-
     mally, as a user, you should not see nor have to worry about
     layers,  but they will affect how some commands ("focus" and
     "resize") behave.

     With this current implementation of screen,  scrolling  data
     will  appear  much  slower in a vertically split region than
     one that is not. This should be taken into consideration  if
     you need to use system commands such as "cat" or "tail -f".

     startup_message on|off

     Select whether you want to see the copyright  notice  during
     startup.  Default is `on', as you probably noticed.

     status [top|up|
          [left|right]

     The status window by default is in bottom-left corner.  This
     command  can  move  status  messages  to  any  corner of the
     screen. top is the same as up, down is the same as bottom.

     stuff [string]

     Stuff the string string in the input buffer of  the  current
     window.  This is like the "paste" command but with much less
     overhead.  Without a parameter, screen  will  prompt  for  a
     string  to  stuff.   You cannot paste large buffers with the
     "stuff" command. It is most useful  for  key  bindings.  See
     also "bindkey".

     su [username [password [

     Substitute the user of a display. The  command  prompts  for
     all  parameters that are omitted. If passwords are specified
     as parameters, they have to  be  specified  un-crypted.  The
     first  password  is matched against the systems passwd data-
     base, the second password  is  matched  against  the  screen
     password  as  set  with the commands "acladd" or "password".
     "Su" may be useful for the screen administrator to test mul-
     tiuser  setups.  When the identification fails, the user has
     access to the commands available for user nobody.  These are
     "detach", "license", "version", "help" and "displays".

     suspend

     Suspend screen.  The windows are in  the  `detached'  state,
     while  screen is suspended. This feature relies on the shell
     being able to do job control.

     term term

     In each window's environment screen opens, the  $TERM  vari-
     able  is set to "screen" by default. But when no description
     for "screen" is installed in the local termcap  or  terminfo
     data  base,  you set $TERM to - say - "vt100". This won't do
     much harm, as screen is VT100/ANSI compatible.  The  use  of
     the  "term"  command is discouraged for non-default purpose.

     That is, one may want  to  specify  special  $TERM  settings
     (e.g.  vt100) for the next "screen rlogin othermachine" com-
     mand. Use the command "screen -T vt100 rlogin  othermachine"
     rather than setting and resetting the default.

     termcap term terminal-tweaks[window-tweaks]

     terminfo term terminal-tweaks[window-tweaks]

     termcapinfo term terminal-tweaks[window-tweaks]

     Use this command to modify  your  terminal's  termcap  entry
     without going through all the hassles involved in creating a
     custom termcap entry.  Plus, you  can  optionally  customize
     the  termcap  generated  for the windows.  You have to place
     these commands in one of the screenrc startup files, as they
     are meaningless once the terminal emulator is booted.

     If your system works uses the terminfo database rather  than
     termcap,  screen  will  understand  the  `terminfo' command,
     which has the same effects as the  `termcap'  command.   Two
     separate  commands are provided, as there are subtle syntac-
     tic differences, e.g. when  parameter  interpolation  (using
     `%')  is  required. Note that termcap names of the capabili-
     ties have to be used with the `terminfo' command.

     In many cases, where the arguments are valid  in  both  ter-
     minfo   and   termcap   syntax,  you  can  use  the  command
     `termcapinfo', which is just  a  shorthand  for  a  pair  of
     `termcap' and `terminfo' commands with identical arguments.

     The first argument specifies  which  terminal(s)  should  be
     affected  by this definition.  You can specify multiple ter-
     minal names by separating them with `|'s.  Use `*' to  match
     all  terminals  and  `vt*' to match all terminals that begin
     with "vt".

     Each tweak argument contains one  or  more  termcap  defines
     (separated  by  `:'s)  to  be  inserted  at the start of the
     appropriate termcap entry, enhancing it or overriding exist-
     ing  values.   The  first  tweak  modifies  your  terminal's
     termcap, and contains definitions that your terminal uses to
     perform  certain  functions.  Specify a null string to leave
     this unchanged (e.g. `').  The second (optional) tweak modi-
     fies all the window termcaps, and should contain definitions
     that screen understands (see  the  "VIRTUAL  TERMINAL"  sec-
     tion).

     Some examples:

          termcap xterm*  LP:hs@

     Informs screen that all terminals that  begin  with  `xterm'
     have  firm  auto-margins that allow the last position on the
     screen to be updated (LP), but  they  don't  really  have  a
     status  line  (no  `hs'  -  append `@' to turn entries off).
     Note that we assume `LP' for all terminal names  that  start
     with  "vt",  but only if you don't specify a termcap command
     for that terminal.
          termcap vt*  LP

     termcap vt102|vt220  Z0=\E[?3h:Z1=\E[?3l

     Specifies the firm-margined `LP' capability for  all  termi-
     nals that begin with `vt', and the second line will also add
     the escape-sequences to switch into (Z0)  and  back  out  of
     (Z1)  132-character-per-line  mode  if  this  is  a VT102 or
     VT220.  (You must specify Z0 and Z1 in your termcap  to  use
     the width-changing commands.)

          termcap vt100  ""  l0=PF1:l1=PF2:l2=PF3:l3=PF4

     This leaves your vt100 termcap alone and adds  the  function
     key labels to each window's termcap entry.

          termcap h19|z19  am@:im=\E@:ei=\EO  dc=\E[P

     Takes a h19 or z19 termcap and turns off auto-margins  (am@)
     and  enables  the insert mode (im) and end-insert (ei) capa-
     bilities (the `@' in the `im' string is after the `=', so it
     is  part  of  the string).  Having the `im' and `ei' defini-
     tions put into your terminal's termcap will cause screen  to
     automatically  advertise  the character-insert capability in
     each window's  termcap.   Each  window  will  also  get  the
     delete-character capability (dc) added to its termcap, which
     screen will translate into a line-update  for  the  terminal
     (we're pretending it doesn't support character deletion).

     If you would like to fully  specify  each  window's  termcap
     entry,  you should instead set the $SCREENCAP variable prior
     to running screen.  See the discussion on the "VIRTUAL  TER-
     MINAL"  in this manual, and the termcap(5) man page for more
     information on termcap definitions.

     time [string]

     Uses the message line to display the time of day,  the  host
     name,  and  the  load averages over 1, 5, and 15 minutes (if
     this is available on  your  system).   For  window  specific
     information, use "info".

     If a string is specified, it changes the format of the  time
     report like it is described in the "STRING ESCAPES" chapter.
     Screen uses a default of "%c:%s %M %d %H%? %l%?".
     title [windowtitle]

     Set the name of the current window  to  windowtitle.  If  no
     name  is specified, screen prompts for one. This command was
     known as `aka' in previous releases.

     truecolor [on|off]

     Enables  truecolor  support.  Currently   autodetection   of
     truecolor support cannot be done reliably, as such it's left
     to user to enable. Default is off.  Known terminals that may
     support it are: iTerm2, Konsole, st.  Xterm includes support
     for truecolor escapes but converts them back to indexed  256
     color space.

     unbindall

     Unbind all the bindings. This can be useful when  screen  is
     used  solely  for its detaching abilities, such as when let-
     ting a console application run as a  daemon.  If,  for  some
     reason,  it  is  necessary  to bind commands after this, use
     `screen -X'.

     unsetenv var

     Unset an environment variable.

     utf8 [on|off[

     Change the encoding used in the current window. If  utf8  is
     enabled,  the  strings  sent  to  the  window  will be UTF-8
     encoded and vice versa. Omitting the parameter  toggles  the
     setting.  If  a  second  parameter  is  given, the display's
     encoding is also changed (this should rather  be  done  with
     screen's  "-U"  option).   See also "defutf8", which changes
     the default setting of a new window.

     vbell [on|off]

     Sets the visual bell setting for this window.  Omitting  the
     parameter  toggles the setting. If vbell is switched on, but
     your terminal does not support  a  visual  bell,  a  `vbell-
     message' is displayed in the status line when the bell char-
     acter (^G) is received.  Visual bell support of  a  terminal
     is defined by the termcap variable `vb' (terminfo: `flash').

     Per default, vbell is off, thus the audible  bell  is  used.
     See also `bell_msg'.

     vbell_msg [message]

     Sets the visual bell message.  message  is  printed  to  the
     status  line  if  the window receives a bell character (^G),
     vbell is set to "on", but the terminal does  not  support  a
     visual   bell.   The  default  message  is  "Wuff,  Wuff!!".
     Without a parameter, the current message is shown.

     vbellwait sec

     Define a delay in seconds after  each  display  of  screen's
     visual bell message. The default is 1 second.

     verbose [on|off]

     If verbose is switched on, the command name is echoed, when-
     ever a window is created (or resurrected from zombie state).
     Default is off.  Without a parameter, the current setting is
     shown.

     version

     Print the current version and the compile date in the status
     line.

     wall message

     Write a message to all displays. The message will appear  in
     the terminal's status line.

     width [-w|-d] [

     Toggle the window width between 80 and 132 columns or set it
     to cols columns if an argument is specified. This requires a
     capable terminal and the termcap entries "Z0" and "Z1".  See
     the  "termcap"  command  for  more information. You can also
     specify a new height if you want to change both values.  The
     -w  option  tells screen to leave the display size unchanged
     and just set the window size, -d vice versa.

     windowlist [-b] [-m] [

     windowlist string [string]

     windowlist title [title]

     Display all windows in a table for visual window  selection.
     If screen was in a window group, screen will back out of the
     group and then display the windows in that group.  If the -b
     option  is  given,  screen  will  switch to the blank window
     before presenting the list, so that the  current  window  is
     also  selectable.   The  -m  option changes the order of the
     windows, instead of sorting by window  numbers  screen  uses
     its  internal  most-recently-used  list.  The -g option will
     show the windows inside any groups in that level  and  down-
     wards.

     The following keys are used to navigate in "windowlist":

     allbox tab(@); l l.  k, C-p, or up@Move up one line.  j,  C-
     n,  or down@Move down one line.  C-g or escape@Exit windowl-
     ist.  C-a or home@Move to the first line.  C-e  or  end@Move
     to the last line.  C-u or C-d@Move one half page up or down.
     C-b or C-f@Move one full page up or  down.   0..9@Using  the
     number  keys, move to the selected line.  mouseclick@T{ Move
     to the selected line. Available when "mousetrack" is set  to
     "on" T} /@Search.  n@Repeat search in the forward direction.
     N@Repeat search in the backward  direction.   m@Toggle  MRU.
     g@Toggle   group   nesting.   a@All  window  view.   C-h  or
     backspace@Back out the group.   ,@Switch  numbers  with  the
     previous window.  K@Kill that window.  space or enter@Select
     that window.

     The table format can be changed with the  string  and  title
     option,  the  title is displayed as table heading, while the
     lines are made by using the string setting. The default set-
     ting is "Num Name%=Flags" for the title and "%3n %t%=%f" for
     the lines.  See the "STRING ESCAPES" chapter for more  codes
     (e.g. color settings).

     "Windowlist" needs a region size of at least  10  characters
     wide and 6 characters high in order to display.

     windows [ string ]

     Uses the message line to display a list of all the  windows.
     Each  window  is  listed  by number with the name of process
     that has been started in the  window  (or  its  title);  the
     current  window is marked with a `*'; the previous window is
     marked with a `-'; all the windows that are "logged in"  are
     marked  with  a `$'; a background window that has received a
     bell is marked with a `!'; a background window that is being
     monitored  and has had activity occur is marked with an `@';
     a window which has output logging turned on is  marked  with
     `(L)';  windows occupied by other users are marked with `&';
     windows in the zombie state are marked with  `Z'.   If  this
     list  is  too long to fit on the terminal's status line only
     the portion around the current  window  is  displayed.   The
     optional  string parameter follows the "STRING ESCAPES" for-
     mat.  If string parameter is  passed,  the  output  size  is
     unlimited.   The  default  command  without any parameter is
     limited to a size of 1024 bytes.

     wrap [on|off]

     Sets the line-wrap setting for  the  current  window.   When
     line-wrap  is on, the second consecutive printable character
     output at the last column of a line will wrap to  the  start
     of  the following line.  As an added feature, backspace (^H)
     will also wrap through the left margin to the previous line.
     Default  is  `on'. Without any options, the state of wrap is
     toggled.

     writebuf [-e encoding

     Writes the contents of the paste  buffer  to  the  specified
     file,  or  the  public accessible screen-exchange file if no
     filename is given. This is thought of as a  primitive  means
     of  communication  between screen users on the same host. If
     an encoding is specified the paste buffer is recoded on  the
     fly to match the encoding.  The filename can be set with the
     bufferfile command and defaults to "/tmp/screen-exchange".

     writelock [on|off|auto]

     In addition to access control lists, not all  users  may  be
     able  to write to the same window at once. Per default, wri-
     telock is in `auto' mode and grants exclusive input  permis-
     sion  to the user who is the first to switch to the particu-
     lar window. When he  leaves  the  window,  other  users  may
     obtain  the  writelock (automatically). The writelock of the
     current window is disabled by the command  "writelock  off".
     If  the  user issues the command "writelock on" he keeps the
     exclusive write permission while switching to other windows.

     xoff

     xon

     Insert a CTRL-s / CTRL-q character to the stdin queue of the
     current window.

     zmodem [off|auto|catch|pass]

     zmodem sendcmd [string]

     zmodem recvcmd [string]

     Define zmodem support for  screen.  Screen  understands  two
     different modes when it detects a zmodem request: "pass" and
     "catch".  If the mode is set to "pass",  screen  will  relay
     all  data  to the attacher until the end of the transmission
     is reached.  In "catch" mode screen acts as  a  zmodem  end-
     point  and  starts  the corresponding rz/sz commands. If the
     mode is set to "auto", screen will use "catch" if the window
     is a tty (e.g. a serial line), otherwise it will use "pass".

     You can define the templates screen uses in "catch" mode via
     the second and the third form.

     Note also that this is an experimental feature.

     zombie [keys[onerror]]

     Per default screen windows are removed from the window  list
     as  soon  as  the windows process (e.g. shell) exits. When a
     string of two keys  is  specified  to  the  zombie  command,
     `dead'  windows  will  remain in the list.  The kill command
     may be used to remove such a window. Pressing the first  key
     in  the  dead  window has the same effect. When pressing the
     second key, screen will attempt to resurrect the window. The
     process  that  was  initially  running in the window will be
     launched again. Calling zombie without parameters will clear
     the zombie setting, thus making windows disappear when their
     process exits.

     As the zombie-setting is manipulated globally for  all  win-
     dows,  this command should probably be called defzombie, but
     it isn't.

     Optionally you can put the word "onerror"  after  the  keys.
     This will cause screen to monitor exit status of the process
     running in the window. If it exits normally ('0'), the  win-
     dow  disappears.  Any  other exit value causes the window to
     become a zombie.

     zombie_timeout[seconds]

     Per default screen windows are removed from the window  list
     as soon as the windows process (e.g. shell) exits. If zombie
     keys are defined (compare with above zombie command), it  is
     possible to also set a timeout when screen tries to automat-
     ically reconnect a dead screen window.

the Message Line
     Screen displays informational messages and other diagnostics
     in a message line.  While this line is distributed to appear
     at the bottom of the screen, it can be defined to appear  at
     the  top of the screen during compilation.  If your terminal
     has a status line defined in its termcap,  screen  will  use
     this  for  displaying  its messages, otherwise a line of the
     current screen will be temporarily  overwritten  and  output
     will   be  momentarily  interrupted.  The  message  line  is
     automatically removed after a few seconds delay, but it  can
     also  be  removed early (on terminals without a status line)
     by beginning to type.

     The message line facility can be used by an application run-
     ning in the current window by means of the ANSI Privacy mes-
     sage control sequence.  For instance, from within the shell,
     try something like:

          echo `<esc>^Hello world from window `$WINDOW'<esc>\\'

     where `<esc>' is an escape, `^' is a literal  up-arrow,  and
     `\\' turns into a single backslash.

Window Types
     Screen provides three different window  types.  New  windows
     are created with screen's screen command (see also the entry
     in chapter "CUSTOMIZATION").  The  first  parameter  to  the
     screen  command defines which type of window is created. The
     different window types are all special cases of  the  normal
     type.  They  have  been added in order to allow screen to be
     used efficiently as a console multiplexer with 100  or  more
     windows.


     *  The normal window contains a shell (default, if no param-
        eter  is given) or any other system command that could be
        executed from a shell (e.g. slogin, etc…)


     *  If  a  tty  (character   special   device)   name   (e.g.
        "/dev/ttya")  is  specified  as the first parameter, then
        the window is directly connected  to  this  device.  This
        window type is similar to "screen cu -l /dev/ttya".  Read
        and write access is  required  on  the  device  node,  an
        exclusive  open is attempted on the node to mark the con-
        nection line as busy.  An optional parameter  is  allowed
        consisting  of  a  comma  separated  list of flags in the
        notation used by stty(1):

        <baud_rate>
             Usually 300,  1200,  9600  or  19200.  This  affects
             transmission as well as receive speed.

        cs8 or cs7
             Specify the transmission of eight  (or  seven)  bits
             per byte.

        ixon or -ixon
             Enables (or disables) software  flow-control  (CTRL-
             S/CTRL-Q) for sending data.

        ixoff or -ixoff
             Enables  (or  disables)  software  flow-control  for
             receiving data.

        istrip or -istrip
             Clear (or keep) the eight bit in each received byte.

        You may want to specify  as  many  of  these  options  as
        applicable. Unspecified options cause the terminal driver
        to make up the parameter values of the connection.  These
        values  are  system  dependent  and may be in defaults or
        values saved from a previous connection.

        For tty windows, the info command shows some of the modem
        control  lines  in  the  status  line.  These may include
        `RTS', `CTS', `DTR', `DSR', `CD' and more.  This  depends
        on  the  available  ioctl()'s  and system header files as
        well as the on the physical capabilities  of  the  serial
        board. Signals that are logical low (inactive) have their
        name preceded by an exclamation mark (!),  otherwise  the
        signal  is  logical high (active).  Signals not supported
        by the hardware but available to  the  ioctl()  interface
        are usually shown low.

        When the CLOCAL status bit is  true,  the  whole  set  of
        modem  signals  is  placed inside curly braces ({ and }).
        When the CRTSCTS or TIOCSOFTCAR bit is set,  the  signals
        `CTS' or `CD' are shown in parenthesis, respectively.

        For tty  windows,  the  command  break  causes  the  Data
        transmission  line (TxD) to go low for a specified period
        of time. This is expected to be interpreted as break sig-
        nal on the other side.  No data is sent and no modem con-
        trol line is changed when a break is issued.


     *  If the first parameter is "//telnet", the second  parame-
        ter  is expected to be a host name, and an optional third
        parameter may specify a TCP port number (default  decimal
        23).   Screen  will  connect to a server listening on the
        remote host and use the telnet  protocol  to  communicate
        with that server.

     For telnet windows, the command info shows details about the
     connection  in  square  brackets ([ and ]) at the end of the
     status line.

          b    BINARY. The connection is in binary mode.

          e    ECHO. Local echo is disabled.

          c    SGA.  The  connection  is  in   `character   mode'
               (default: `line mode').

          t    TTYPE. The terminal type has been requested by the
               remote  host.   Screen  sends  the  name  "screen"
               unless instructed otherwise (see also the  command
               `term').

          w    NAWS. The remote site  is  notified  about  window
               size changes.

          f    LFLOW. The remote  host  will  send  flow  control
               information.  (Ignored at the moment.)

          Additional  flags  for  debugging  are  x,  t   and   n
          (XDISPLOC, TSPEED and NEWENV).

          For telnet windows, the command break sends the  telnet
          code IAC BREAK (decimal 243) to the remote host.


          This window type is only available if screen  was  com-
          piled with the ENABLE_TELNET option defined.

String Escapes
     Screen provides an escape mechanism  to  insert  information
     like  the  current  time  into  messages  or file names. The
     escape character is `%' with  one  exception:  inside  of  a
     window's hardstatus `^%' ('^E') is used instead.

     Here is the full list of supported escapes:

     %    the escape character itself

     E    sets %? to  true  if  the  escape  character  has  been
          pressed.

     f    flags of the window, see "windows" for meanings of  the
          various flags

     F    sets %? to true if the window has the focus

     h    hardstatus of the window

     H    hostname of the system

     n    window number

     P    sets %? to true if the current region is in  copy/paste
          mode

     S    session name

     s    window size

     t    window title

     u    all other users on this window

     w    all window numbers and names. With `-' qualifier: up to
          the  current  window; with `+' qualifier: starting with
          the window after the current one.

     W    all window numbers and names except the current one

     x    the executed command  including  arguments  running  in
          this windows

     X    the executed command without arguments running in  this
          windows

     ?    the part to the next `%?' is displayed only  if  a  `%'
          escape inside the part expands to a non-empty string

     :    else part of `%?'

     =    pad the string  to  the  display's  width  (like  TeX's
          hfill). If a number is specified, pad to the percentage
          of the window's width.  A `0' qualifier tells screen to
          treat the number as absolute position.  You can specify
          to pad relative to the last absolute  pad  position  by
          adding  a `+' qualifier or to pad relative to the right
          margin by using `-'. The padding truncates  the  string
          if the specified position lies before the current posi-
          tion. Add the `L' qualifier to change this.

     <    same as `%=' but just do truncation, do not  fill  with
          spaces

     >    mark the current text position for the next truncation.
          When  screen  needs to do truncation, it tries to do it
          in a way that the marked position  gets  moved  to  the
          specified  percentage  of  the  output  area. (The area
          starts from the last absolute  pad  position  and  ends
          with  the  position  specified by the truncation opera-
          tor.) The `L' qualifier tells screen to mark the  trun-
          cated parts with `…'.

     {    attribute/color modifier string terminated by the  next
          "}"

     `    Substitute with the output of a `backtick' command. The
          length qualifier is misused to identify one of the com-
          mands.

     The `c' and `C' escape may be qualified with a `0'  to  make
     screen  use zero instead of space as fill character. The `0'
     qualifier also makes the `=' escape use absolute  positions.
     The  `n' and `=' escapes understand a length qualifier (e.g.
     `%3n'), `D' and `M' can be prefixed  with  `L'  to  generate
     long names, `w' and `W' also show the window flags if `L' is
     given.

     An attribute/color modifier is is used to change the  attri-
     butes  or  the  color  settings.  Its  format is "[attribute
     modifier] [color description]". The attribute modifier  must
     be prefixed by a change type indicator if it can be confused
     with a color description. The  following  change  types  are
     known:

     +    add the specified set to the current attributes

     -    remove the set from the current attributes

     !    invert the set in the current attributes

     =    change the current attributes to the specified set

     The attribute set can either be specified as  a  hexadecimal
     number or a combination of the following letters:

     d    dim
     u    underline
     b    bold
     r    reverse
     s    standout
     B    blinking

     Colors are coded either  as  a  hexadecimal  number  or  two
     letters  specifying  the  desired  background and foreground
     color (in that order). The following colors are known:

     k    black
     r    red
     g    green
     y    yellow
     b    blue
     m    magenta
     c    cyan
     w    white
     d    default color
     .    leave color unchanged

     The  capitalized  versions  of  the  letter  specify  bright
     colors.  You  can  also use the pseudo-color `i' to set just
     the brightness and leave the color unchanged.
     A one digit/letter color description  is  treated  as  fore-
     ground  or  background color dependent on the current attri-
     butes: if reverse mode  is  set,  the  background  color  is
     changed  instead of the foreground color.  If you don't like
     this, prefix the color with a ".".  If  you  want  the  same
     behavior for two-letter color descriptions, also prefix them
     with a ".".
     As a special case, "%{-}" restores the attributes and colors
     that  were  set  before the last change was made (i.e., pops
     one level of the color-change stack).

     Examples:  "" .nr )I G""n

          set color to bright green

          use bold red

          clear all attributes, write in default color on  yellow
          background.

     %-Lw%{= BW}%50>%n%f* %t%{-}%+Lw%<
          The available windows centered at  the  current  window
          and  truncated to the available width. The current win-
          dow is displayed white on blue.  This can be used  with
          "hardstatus alwayslastline".

     %?%F%{.R.}%?%3n %t%? [%h]%?
          The  window  number  and   title   and   the   window's
          hardstatus,  if  one is set.  Also use a red background
          if this  is  the  active  focus.  Useful  for  "caption
          string".

Flow-control
     Each window has a flow-control setting that  determines  how
     screen  deals  with the XON and XOFF characters (and perhaps
     the interrupt character).  When flow-control is turned  off,
     screen ignores the XON and XOFF characters, which allows the
     user to send them to the current program  by  simply  typing
     them  (useful  for  the  emacs  editor,  for instance).  The
     trade-off is that it will take  longer  for  output  from  a
     "normal"  program  to  pause  in  response to an XOFF.  With
     flow-control turned on, XON and XOFF characters are used  to
     immediately pause the output of the current window.  You can
     still send these characters to the current program, but  you
     must use the appropriate two-character screen commands (typ-
     ically "C-a q" (xon) and "C-a s" (xoff)).  The xon/xoff com-
     mands are also useful for typing C-s and C-q past a terminal
     that intercepts these characters.

     Each window has  an  initial  flow-control  value  set  with
     either the -f option or the "defflow" .screenrc command. Per
     default the windows are set to automatic flow-switching.  It
     can  then  be  toggled  between the three states `fixed on',
     `fixed off' and `automatic' interactively  with  the  "flow"
     command bound to "C-a f".

     The automatic flow-switching mode deals  with  flow  control
     using  the  TIOCPKT  mode  (like  "rlogin" does). If the tty
     driver does not support TIOCPKT, screen tries  to  find  out
     the  right mode based on the current setting of the applica-
     tion keypad - when it is enabled, flow-control is turned off
     and  visa  versa.  Of course, you can still manipulate flow-
     control manually when needed.

     If you're running with flow-control enabled  and  find  that
     pressing  the interrupt key (usually C-c) does not interrupt
     the display until another 6-8 lines have  scrolled  by,  try
     running  screen with the "interrupt" option (add the "inter-
     rupt" flag to the "flow" command in your .screenrc,  or  use
     the  -i  command-line  option).  This causes the output that
     screen has accumulated from the interrupted  program  to  be
     flushed.   One  disadvantage  is that the virtual terminal's
     memory contains the non-flushed version of the output, which
     in  rare  cases  can cause minor inaccuracies in the output.
     For example, if you switch screens and return, or update the
     screen  with "C-a l" you would see the version of the output
     you would have gotten without "interrupt" being  on.   Also,
     you  might  need  to turn off flow-control (or use auto-flow
     mode to turn it off automatically) when  running  a  program
     that  expects  you to type the interrupt character as input,
     as it is possible to interrupt the  output  of  the  virtual
     terminal  to  your  physical  terminal  when flow-control is
     enabled.  If this happens, a simple refresh  of  the  screen
     with "C-a l" will restore it.  Give each mode a try, and use
     whichever mode you find more comfortable.

TITLES (naming windows)
     You can customize each window's name in the  window  display
     (viewed  with  the  "windows" command (C-a w)) by setting it
     with one of the title commands.  Normally the name displayed
     is  the  actual  command  name of the program created in the
     window.  However, it  is  sometimes  useful  to  distinguish
     various  programs of the same name or to change the name on-
     the-fly to reflect the current state of the window.

     The default name for all shell windows can be set  with  the
     "shelltitle"  command in the .screenrc file, while all other
     windows are created with a "screen"  command  and  thus  can
     have  their  name  set  with  the -t option.  Interactively,
     there is the title-string escape-sequence (<esc>kname<esc>\)
     and  the  "title" command (C-a A).  The former can be output
     from an application  to  control  the  window's  name  under
     software control, and the latter will prompt for a name when
     typed.  You can also bind pre-defined names to keys with the
     "title"  command  to  set  things quickly without prompting.
     Changing title bythis escape sequence can be  controlled  by
     defdynamictitle and dynamictitle commands.

     Finally, screen  has  a  shell-specific  heuristic  that  is
     enabled  by  setting  the window's name to "search|name" and
     arranging to have a null title escape-sequence output  as  a
     part  of  your prompt.  The search portion specifies an end-
     of-prompt search string, while the  name  portion  specifies
     the  default shell name for the window.  If the name ends in
     a `:'  screen will add what it believes to  be  the  current
     command  running  in  the  window to the end of the window's
     shell name (e.g. "name:cmd").  Otherwise the current command
     name supersedes the shell name while it is running.

     Here's how it works:  you must modify your shell  prompt  to
     output a null title-escape-sequence (<esc>k<esc>\) as a part
     of your prompt.  The last part of your prompt  must  be  the
     same  as  the string you specified for the search portion of
     the title.  Once this is set up, screen will use the  title-
     escape-sequence  to  clear the previous command name and get
     ready for  the  next  command.   Then,  when  a  newline  is
     received from the shell, a search is made for the end of the
     prompt.  If found, it will grab the  first  word  after  the
     matched  string and use it as the command name.  If the com-
     mand name begins with either `!', `%', or  `^'  screen  will
     use  the  first  word  on  the  following line (if found) in
     preference to the just-found name.  This helps csh users get
     better  command  names  when  using  job  control or history
     recall commands.

     Here's some .screenrc examples:

          screen -t top 2 nice top

     Adding this line to your .screenrc would start a nice-d ver-
     sion  of  the  "top"  command in window 2 named "top" rather
     than "nice".

                 shelltitle `> |csh'
                 screen 1

     These commands would start a shell with the  given  shellti-
     tle.  The title specified is an auto-title that would expect
     the prompt and the typed command to look something like  the
     following:

          /usr/joe/src/dir> trn

     (it looks after the `> ` for the command name).  The  window
     status  would show the name "trn" while the command was run-
     ning, and revert to "csh" upon completion.

          bind R screen -t `% |root:' su

     Having this command in your .screenrc  would  bind  the  key
     sequence  "C-a  R"  to the "su" command and give it an auto-
     title name of "root:".  For this  auto-title  to  work,  the
     screen could look something like this:

                 % !em
                 emacs file.c

     Here the user typed the csh history command "!em" which  ran
     the  previously  entered "emacs" command.  The window status
     would show "root:emacs" during the execution of the command,
     and revert to simply "root:" at its completion.

                 bind o title
                 bind E title ""
                 bind u title (unknown)

     The first binding doesn't have any arguments,  so  it  would
     prompt  you  for a title. when you type "C-a o".  The second
     binding would clear an auto-title's current setting (C-a E).
     The  third  binding  would set the current window's title to
     "(unknown)" (C-a u).

     One thing to keep in mind when adding a  null  title-escape-
     sequence  to  your prompt is that some shells (like the csh)
     count all the non-control characters as part of the prompt's
     length.   If these invisible characters aren't a multiple of
     8 then backspacing over a tab will result  in  an  incorrect
     display.  One way to get around this is to use a prompt like
     this:

          set prompt='^[[0000m^[k^[\% `

     The escape-sequence "<esc>[0000m" not  only  normalizes  the
     character  attributes, but all the zeros round the length of
     the invisible characters up to 8.  Bash users will  probably
     want to echo the escape sequence in the PROMPT_COMMAND:

          PROMPT_COMMAND='printf "\033k\033\134"'

     (I used "\134" to output a `\' because  of  a  bug  in  bash
     v1.04).

the Virtual Terminal
     Each window in a screen session emulates a  VT100  terminal,
     with  some  extra  functions  added.  The  VT100 emulator is
     hard-coded, no other terminal types can be emulated.
     Usually screen tries to emulate as much  of  the  VT100/ANSI
     standard  as  possible.  But  if your terminal lacks certain
     capabilities, the emulation may not be  complete.  In  these
     cases  screen  has to tell the applications that some of the
     features are missing. This is no problem on  machines  using
     termcap,  because  screen  can  use the $TERMCAP variable to
     customize the standard screen termcap.

     But if you do a rlogin on another machine  or  your  machine
     supports  only  terminfo this method fails. Because of this,
     screen offers a way to deal with these cases. Here is how it
     works:

     When screen tries to figure out a terminal name for  itself,
     it  first  looks  for  an entry named "screen.<term>", where
     <term> is the contents of your $TERM variable.  If  no  such
     entry  exists,  screen  tries "screen" (or "screen-w" if the
     terminal is wide (132 cols or more)).  If  even  this  entry
     cannot be found, "vt100" is used as a substitute.

     The idea is that if you have a terminal which  doesn't  sup-
     port an important feature (e.g. delete char or clear to EOS)
     you can build a new termcap/terminfo entry for screen (named
     "screen.<dumbterm>")  in which this capability has been dis-
     abled. If this entry is installed on your machines  you  are
     able   to   do   a   rlogin   and  still  keep  the  correct
     termcap/terminfo entry.  The terminal name  is  put  in  the
     $TERM  variable  of  all  new windows.  Screen also sets the
     $TERMCAP variable reflecting the capabilities of the virtual
     terminal  emulated.  Notice that, however, on machines using
     the terminfo database this variable has no effect.  Further-
     more,  the  variable  $WINDOW is set to the window number of
     each window.

     The actual set of capabilities supported by the virtual ter-
     minal  depends on the capabilities supported by the physical
     terminal.  If, for instance, the physical terminal does  not
     support  underscore  mode,  screen does not put the `us' and
     `ue'  capabilities  into  the  window's  $TERMCAP  variable,
     accordingly.  However, a minimum number of capabilities must
     be supported by a terminal in order to  run  screen;  namely
     scrolling,  clear  screen,  and direct cursor addressing (in
     addition, screen does not run on hardcopy  terminals  or  on
     terminals that over-strike).

     Also, you can customize the $TERMCAP value used by screen by
     using  the  "termcap"  .screenrc command, or by defining the
     variable $SCREENCAP prior to startup.  When  the  is  latter
     defined,  its  value  will  be  copied  verbatim  into  each
     window's $TERMCAP variable.  This can  either  be  the  full
     terminal  definition,  or  a  filename  where  the  terminal
     "screen" (and/or "screen-w") is defined.

     Note that screen honors the "terminfo" .screenrc command  if
     the system uses the terminfo database rather than termcap.

     When the boolean `G0' capability is present in  the  termcap
     entry  for the terminal on which screen has been called, the
     terminal emulation of  screen  supports  multiple  character
     sets.   This  allows  an  application  to  make  use of, for
     instance, the VT100 graphics character set or national char-
     acter  sets.   The following control functions from ISO 2022
     are supported:  lock shift G0 (SI), lock shift G1 (SO), lock
     shift  G2,  lock shift G3, single shift G2, and single shift
     G3.  When a virtual terminal is created or reset, the  ASCII
     character set is designated as G0 through G3.  When the `G0'
     capability is present,  screen  evaluates  the  capabilities
     `S0',  `E0',  and  `C0' if present. `S0' is the sequence the
     terminal uses to enable and start the graphics character set
     rather  than  SI.  `E0' is the corresponding replacement for
     SO. `C0' gives a character by character  translation  string
     that is used during semi-graphics mode. This string is built
     like the `acsc' terminfo capability.

     When the `po' and  `pf'  capabilities  are  present  in  the
     terminal's  termcap  entry, applications running in a screen
     window can send output to the printer port of the  terminal.
     This  allows  a  user  to  have an application in one window
     sending output to a printer connected to the terminal, while
     all  other  windows  are  still  active (the printer port is
     enabled and disabled again for each chunk of output).  As  a
     side-effect,  programs running in different windows can send
     output to the printer  simultaneously.   Data  sent  to  the
     printer  is  not  displayed in the window.  The info command
     displays a line starting `PRIN' while the printer is active.

     Screen maintains a hardstatus line for every  window.  If  a
     window  gets  selected,  the  display's  hardstatus  will be
     updated to  match  the  window's  hardstatus  line.  If  the
     display  has  no  hardstatus the line will be displayed as a
     standard screen message.  The hardstatus line can be changed
     with   the   ANSI   Application   Program   Command   (APC):
     "ESC_<string>ESC\". As a convenience  for  xterm  users  the
     sequence "ESC]0..2;<string>^G" is also accepted.

     Some capabilities are only put into the $TERMCAP variable of
     the  virtual terminal if they can be efficiently implemented
     by the physical terminal.  For instance, `dl' (delete  line)
     is  only put into the $TERMCAP variable if the terminal sup-
     ports either delete line itself or scrolling  regions.  Note
     that  this  may provoke confusion, when the session is reat-
     tached on a different terminal, as  the  value  of  $TERMCAP
     cannot be modified by parent processes.

     The "alternate screen" capability is not enabled by default.
     Set the altscreen .screenrc command to enable it.

     The following is a list of control sequences  recognized  by
     screen.   "(V)"  and "(A)" indicate VT100-specific and ANSI-
     or ISO-specific functions, respectively.

     ESC E                      Next Line

     ESC D                      Index

     ESC M                      Reverse Index

     ESC H                      Horizontal Tab Set

     ESC Z                      Send VT100 Identification String

     ESC 7                 (V)  Save Cursor and Attributes

     ESC 8                 (V)  Restore Cursor and Attributes

     ESC [s                (A)  Save Cursor and Attributes

     ESC [u                (A)  Restore Cursor and Attributes

     ESC c                      Reset to Initial State

     ESC g                      Visual Bell

     ESC Pn p                   Cursor Visibility (97801)

                                Pn = 6        Invisible

                                Pn = 7        Visible

     ESC =                 (V)  Application Keypad Mode

     ESC >                 (V)  Numeric Keypad Mode

     ESC # 8               (V)  Fill Screen with E's

     ESC \                 (A)  String Terminator

     ESC ^                 (A)  Privacy Message  String  (Message
                                Line)

     ESC !                      Global  Message  String  (Message
                                Line)

     ESC k                      A.k.a. Definition String

     ESC P                 (A)  Device Control String.  Outputs a
                                string  directly to the host ter-
                                minal without interpretation.

     ESC _                 (A)  Application    Program    Command
                                (Hardstatus)

     ESC ] 0 ; string ^G   (A)  Operating     System      Command
                                (Hardstatus, xterm title hack)

     ESC ] 83 ; cmd ^G     (A)  Execute screen command. This only
                                works  if  multi-user  support is
                                compiled   into    screen.   The
                                pseudo-user ":window:" is used to
                                check the  access  control  list.
                                Use  "addacl :window: -rwx #?" to
                                create a user with no rights  and
                                allow only the needed commands.

     Control-N             (A)  Lock Shift G1 (SO)

     Control-O             (A)  Lock Shift G0 (SI)

     ESC n                 (A)  Lock Shift G2

     ESC o                 (A)  Lock Shift G3

     ESC N                 (A)  Single Shift G2

     ESC O                 (A)  Single Shift G3

     ESC ( Pcs             (A)  Designate character set as G0

     ESC ) Pcs             (A)  Designate character set as G1

     ESC * Pcs             (A)  Designate character set as G2

     ESC + Pcs             (A)  Designate character set as G3

     ESC [ Pn ; Pn H            Direct Cursor Addressing

     ESC [ Pn ; Pn f            same as above

     ESC [ Pn J                 Erase in Display

                                Pn = None or 0      From
                                          Cursor
                                          to End
                                          of
                                          Screen

                                Pn = 1        From
                                          Begin-
                                          ning
                                          of
                                          Screen
                                          to
                                          Cursor

                                Pn = 2        Entire
                                          Screen

     ESC [ Pn K                 Erase in Line

                                Pn = None or 0      From
                                          Cursor
                                          to End
                                          of
                                          Line

                                Pn = 1        From
                                          Begin-
                                          ning
                                          of
                                          Line
                                          to
                                          Cursor

                                Pn = 2        Entire
                                          Line

     ESC [ Pn X                 Erase character

     ESC [ Pn A                 Cursor Up

     ESC [ Pn B                 Cursor Down

     ESC [ Pn C                 Cursor Right

     ESC [ Pn D                 Cursor Left

     ESC [ Pn E                 Cursor next line

     ESC [ Pn F                 Cursor previous line

     ESC [ Pn G                 Cursor horizontal position

     ESC [ Pn `                 same as above

     ESC [ Pn d                 Cursor vertical position

     ESC [ Ps ;…; Ps m        Select Graphic Rendition

                                Ps = None or 0      Default
                                          Rendi-
                                          tion

                                Ps = 1        Bold

                                Ps = 2        (A)  Faint

                                Ps = 3        (A)  Standout
                                          Mode
                                          (ANSI:
                                          Itali-
                                          cized)

                                Ps = 4        Underlined

                                Ps = 5        Blinking

                                Ps = 7        Negative
                                          Image

                                Ps = 22        (A)  Normal
                                          Inten-
                                          sity

                                Ps = 23        (A)  Standout
                                          Mode
                                          off
                                          (ANSI:
                                          Itali-
                                          cized
                                          off)

                                Ps = 24        (A)  Not
                                          Under-
                                          lined

                                Ps = 25        (A)  Not
                                          Blink-
                                          ing

                                Ps = 27        (A)  Positive
                                          Image

                                Ps = 30        (A)  Foreground
                                          Black

                                Ps = 31        (A)  Foreground
                                          Red

                                Ps = 32        (A)  Foreground
                                          Green

                                Ps = 33        (A)  Foreground
                                          Yellow

                                Ps = 34        (A)  Foreground
                                          Blue

                                Ps = 35        (A)  Foreground
                                          Magenta

                                Ps = 36        (A)  Foreground
                                          Cyan

                                Ps = 37        (A)  Foreground
                                          White

                                Ps = 39        (A)  Foreground
                                          Default

                                Ps = 40        (A)  Background
                                          Black

                                Ps = …        …

                                Ps = 49        (A)  Background
                                          Default

     ESC [ Pn g                 Tab Clear

                                Pn = None or 0      Clear
                                          Tab at
                                          Current
                                          Posi-
                                          tion

                                Pn = 3        Clear
                                          All
                                          Tabs

     ESC [ Pn ; Pn r       (V)  Set Scrolling Region

     ESC [ Pn I            (A)  Horizontal Tab

     ESC [ Pn Z            (A)  Backward Tab

     ESC [ Pn L            (A)  Insert Line

     ESC [ Pn M            (A)  Delete Line

     ESC [ Pn @            (A)  Insert Character

     ESC [ Pn P            (A)  Delete Character

     ESC [ Pn S                 Scroll Scrolling Region Up

     ESC [ Pn T                 Scroll Scrolling Region Down

     ESC [ Pn ^                 same as above

     ESC [ Ps ;…; Ps h        Set Mode

     ESC [ Ps ;…; Ps l        Reset Mode

                                Ps = 4        (A)  Insert
                                          Mode

                                Ps = 20        (A)  Automatic
                                          Linefeed
                                          Mode

                                Ps = 34        Normal
                                          Cursor
                                          Visi-
                                          bility

                                Ps = ?1        (V)  Application
                                          Cursor
                                          Keys

                                Ps = ?3        (V)  Change
                                          Termi-
                                          nal
                                          Width
                                          to 132
                                          columns

                                Ps = ?5        (V)  Reverse
                                          Video

                                Ps = ?6        (V)  Origin
                                          Mode

                                Ps = ?7        (V)  Wrap
                                          Mode

                                Ps = ?9        X10
                                          mouse
                                          track-
                                          ing

                                Ps = ?25        (V)  Visible
                                          Cursor

                                Ps = ?47        Alternate
                                          Screen
                                          (old
                                          xterm
                                          code)

                                Ps = ?1000        (V)  VT200
                                          mouse
                                          track-

                                          ing
                                Ps = ?1047        Alternate
                                          Screen
                                          (new
                                          xterm
                                          code)

                                Ps = ?1049        Alternate
                                          Screen
                                          (new
                                          xterm
                                          code)

     ESC [ 5 i             (A)  Start  relay  to  printer   (ANSI
                                Media Copy)

     ESC [ 4 i             (A)  Stop relay to printer (ANSI Media
                                Copy)

     ESC [ 8 ; Ph ; Pw t        Resize the window to  `Ph'  lines
                                and  `Pw'  columns  (SunView spe-
                                cial)

     ESC [ c                    Send VT100 Identification String

     ESC [ x                    Send Terminal Parameter Report

     ESC [ > c                  Send   VT220   Secondary   Device
                                Attributes String

     ESC [ 6 n                  Send Cursor Position Report

Input Translation
     In order to do a full VT100 emulation screen has  to  detect
     that  a  sequence of characters in the input stream was gen-
     erated by a keypress on the user's keyboard and  insert  the
     VT100  style escape sequence. Screen has a very flexible way
     of doing this by making it possible to  map  arbitrary  com-
     mands  on  arbitrary  sequences  of characters. For standard
     VT100 emulation the command will always insert a  string  in
     the  input  buffer  of the window (see also command stuff in
     the command table).  Because the sequences  generated  by  a
     keypress can change after a reattach from a different termi-
     nal type, it is possible to bind  commands  to  the  termcap
     name  of  the  keys.  Screen will insert the correct binding
     after each reattach. See the  bindkey  command  for  further
     details on the syntax and examples.

     Here is the table of the default key bindings. The fourth is
     what  command  is  executed if the keyboard is switched into
     application mode.

     allbox; l l l l.  Key name              Termcap  nameComman-
     dApp   mode   Cursor   up             ku\033[A\033OA  Cursor
     down           kd\033[B\033OB                         Cursor
     right          kr\033[C\033OC                         Cursor
     left           kl\033[D\033OD          Function          key
     0        k0\033[10~  Function key 1        k1\033OP Function
     key 2        k2\033OQ Function key  3        k3\033OR  Func-
     tion  key 4        k4\033OS Function key 5        k5\033[15~
     Function    key     6        k6\033[17~     Function     key
     7        k7\033[18~  Function  key 8        k8\033[19~ Func-
     tion     key      9        k9\033[20~      Function      key
     10       k;\033[21~  Function  key 11       F1\033[23~ Func-
     tion key 12       F2\033[24~ Home                  kh\033[1~
     End                   kH\033[4~
     Insert                kI\033[2~
     Delete                kD\033[3~                     Page
     up               kP\033[5~  Page  down             kN\033[6~
     Keypad            0              f00\033Op           Keypad
     1              f11\033Oq   Keypad   2              f22\033Or
     Keypad            3              f33\033Os           Keypad
     4              f44\033Ot   Keypad   5              f55\033Ou
     Keypad            6              f66\033Ov           Keypad
     7              f77\033Ow   Keypad   8              f88\033Ox
     Keypad            9              f99\033Oy           Keypad
     +              f++\033Ok   Keypad   -              f--\033Om
     Keypad            *              f**\033Oj           Keypad
     /              f//\033Oo   Keypad   =              fq=\033OX
     Keypad            .              f..\033On           Keypad
     ,              f,,\033Ol Keypad enter          fe\015\033OM

Special Terminal Capabilities
     The following table describes all terminal capabilities that
     are  recognized  by  screen  and  are  not in the termcap(5)
     manual.  You can place these capabilities  in  your  termcap
     entries  (in  `/etc/termcap')  or use them with the commands
     `termcap', `terminfo' and  `termcapinfo'  in  your  screenrc
     files.  It is often not possible to place these capabilities
     in the terminfo database.

     LP   (bool)  Terminal has VT100 style margins  (`magic  mar-
                  gins').  Note  that this capability is obsolete
                  because screen uses the standard `xn' instead.

     Z0   (str)   Change width to 132 columns.

     Z1   (str)   Change width to 80 columns.

     WS   (str)   Resize display. This capability has the desired
                  width  and  height  as  arguments.  SunView(tm)
                  example: `\E[8;%d;%dt'.

     NF   (bool)  Terminal doesn't need flow control. Send ^S and
                  ^Q  direct  to  the  application. Same as `flow
                  off'. The opposite of this capability is `nx'.

     G0   (bool)  Terminal can deal with ISO 2022 font  selection
                  sequences.

     S0   (str)   Switch charset `G0' to the  specified  charset.
                  Default is `\E(%.'.

     E0   (str)   Switch charset `G0' back to  standard  charset.
                  Default is `\E(B'.

     C0   (str)   Use the string as a conversion table  for  font
                  `0'. See the `ac' capability for more details.

     CS   (str)   Switch cursor-keys to application mode.

     CE   (str)   Switch cursor-keys back to normal mode.

     AN   (bool)  Turn on autonuke. See  the  `autonuke'  command
                  for more details.

     OL   (num)   Set  the   output   buffer   limit.   See   the
                  `obuflimit' command for more details.

     KJ   (str)   Set the  encoding  of  the  terminal.  See  the
                  `encoding' command for valid encodings.

     AF   (str)   Change character foreground color  in  an  ANSI
                  conform way. This capability will almost always
                  be set to `\E[3%dm' ('\E[3%p1%dm'  on  terminfo
                  machines).

     AB   (str)   Same as `AF', but change background color.

     AX   (bool)  Does understand ANSI set  default  fg/bg  color
                  (\E[39m / \E[49m).

     XC   (str)   Describe a translation of characters to strings
                  depending  on  the  current  font. More details
                  follow in the next section.

     XT   (bool)  Terminal understands  special  xterm  sequences
                  (OSC, mouse tracking).

     C8   (bool)  Terminal needs bold to  display  high-intensity
                  colors (e.g. Eterm).

     TF   (bool)  Add missing capabilities  to  the  termcap/info
                  entry. (Set by default).

Character Translation
     Screen has a powerful mechanism to translate  characters  to
     arbitrary strings depending on the current font and terminal
     type.  Use this feature if you want to work  with  a  common
     standard  character  set (say ISO8851-latin1) even on termi-
     nals that scatter the more unusual characters  over  several
     national language font pages.

     Syntax:
         XC=<charset-mapping>{,,<charset-mapping>}
         <charset-mapping> := <designator><template>{,<mapping>}
         <mapping> := <char-to-be-mapped><template-arg>

     The things in braces may be repeated any number of times.

     A <charset-mapping> tells screen how to  map  characters  in
     font  <designator>  ('B': Ascii, `A': UK, `K': German, etc.)
     to strings. Every <mapping> describes to what string a  sin-
     gle  character  will  be translated. A template mechanism is
     used, as most of the time the codes have  a  lot  in  common
     (for example strings to switch to and from another charset).
     Each occurrence of `%' in <template> gets  substituted  with
     the <template-arg> specified together with the character. If
     your strings are not similar at all, then use `%' as a  tem-
     plate and place the full string in <template-arg>. A quoting
     mechanism was added to make it possible to use a  real  `%'.
     The  `\'  character  quotes the special characters `\', `%',
     and `,'.

     Here is an example:

         termcap hp700 `XC=B\E(K%\E(B,\304[,\326\\\\,\334]'

     This tells screen how to translate ISOlatin1  (charset  `B')
     upper  case umlaut characters on a hp700 terminal that has a
     German charset. `\304' gets translated to `\E(K[\E(B' and so
     on.   Note  that  this line gets parsed *three* times before
     the internal lookup table is built, therefore a lot of quot-
     ing is needed to create a single `\'.

     Another extension was added to allow more  emulation:  If  a
     mapping translates the unquoted `%' char, it will be sent to
     the terminal whenever screen switches to  the  corresponding
     <designator>.  In  this special case the template is assumed
     to be just `%' because the charset switch sequence  and  the
     character mappings normally haven't much in common.

     This example shows one use of the extension:

         termcap xterm `XC=K%,%\E(B,[\304,\\\\\326,]\334'

     Here, a part of the German ('K') charset is emulated  on  an
     xterm.   If  screen has to change to the `K' charset, `\E(B'
     will be sent to the terminal, i.e. the ASCII charset is used
     instead.  The  template  is  just  `%',  so  the  mapping is
     straightforward: `[' to `\304', `\' to `\326',  and  `]'  to
     `\334'.

Environment
     COLUMNS        Number of columns on the terminal  (overrides
                    termcap entry).
     HOME           Directory in which to look for .screenrc.
     LINES          Number of lines on  the  terminal  (overrides
                    termcap entry).
     LOCKPRG        Screen lock program.
     NETHACKOPTIONS Turns on nethack option.
     PATH           Used for locating programs to run.
     SCREENCAP      For customizing a terminal's TERMCAP value.
     SCREENDIR      Alternate socket directory.
     SCREENRC       Alternate user screenrc file.
     SHELL          Default shell  program  for  opening  windows
                    (default   "/bin/sh").    See   also  "shell"
                    .screenrc command.
     STY            Alternate socket name.
     SYSSCREENRC    Alternate system screenrc file.
     TERM           Terminal name.
     TERMCAP        Terminal description.
     WINDOW         Window number of a window (at creation time).

Files
     …/screen-4.?.??/etc/screenrc
     …/screen-4.?.??/etc/etcscreenrc Examples  in  the   screen
                                       distribution  package  for
                                       private  and  global  ini-
                                       tialization files.
     $SYSSCREENRC
     /usr/local/etc/screenrc           screen initialization com-
                                       mands
     $SCREENRC
     $HOME/.screenrc                   Read       in        after
                                       /usr/local/etc/screenrc
     $SCREENDIR/S-<login>
     /local/screens/S-<login>          Socket         directories
                                       (default)
     /usr/tmp/screens/S-<login>        Alternate  socket   direc-
                                       tories.
     <socket directory>/.termcap       Written by  the  "termcap"
                                       output function
     /usr/tmp/screens/screen-exchange  or
     /tmp/screen-exchange              screen       `interprocess

                                       communication buffer'
     hardcopy.[0-9]                    Screen images  created  by
                                       the hardcopy function
     screenlog.[0-9]                   Output log  files  created
                                       by the log function
     /usr/lib/terminfo/?/*             or
     /etc/termcap                      Terminal capability  data-
                                       bases
     /etc/utmp                         Login records
     $LOCKPRG                          Program that locks a  ter-
                                       minal.

See Also
     termcap(5), utmp(5), vi(1), captoinfo(1), tic(1)

Authors
     Originally created by Oliver Laumann. For a long time  main-
     tained  and developed by Juergen Weigert, Michael Schroeder,
     Micah Cowan and Sadrul Habib Chowdhury. This latest  version
     was  produced  by  Amadeusz Slawinski <amade@asmblr.net> and
     Alexander Naumov <alexander_naumov@opensuse.org>.

Copyleft
     Copyright (c) 2015-2017
          Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
          Alexander Naumov <alexander_naumov@opensuse.org>
          Amadeusz Slawinski <amade@asmblr.net>
     Copyright (c) 2010-2015
          Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
          Sadrul Habib Chowdhury <sadrul@users.sourceforge.net>
     Copyright (c) 2008, 2009
          Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
          Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
          Micah Cowan <micah@cowan.name>
          Sadrul Habib Chowdhury <sadrul@users.sourceforge.net>
     Copyright (C) 1993-2003
          Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
          Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
     Copyright (C) 1987 Oliver Laumann
     This program is  free  software;  you  can  redistribute  it
     and/or  modify  it under the terms of the GNU General Public
     License as published by the Free Software Foundation; either
     version 3, or (at your option) any later version.
     This program is distributed in the hope that it will be use-
     ful, but WITHOUT ANY WARRANTY; without even the implied war-
     ranty of MERCHANTABILITY or FITNESS FOR  A  PARTICULAR  PUR-
     POSE.  See the GNU General Public License for more details.
     You should have received a copy of the  GNU  General  Public
     License  along  with this program (see the file COPYING); if
     not, write to the Free Software Foundation, Inc., 59  Temple

     Place - Suite 330, Boston, MA  02111-1307, USA

Contributors
     Eric S. Raymond <esr@thyrsus.com>,
     Thomas Renninger <treen@suse.com>,
     Axel Beckert <abe@deuxchevaux.org>,
     Ken Beal <kbeal@amber.ssd.csd.harris.com>,
     Rudolf Koenig <rfkoenig@immd4.informatik.uni-erlangen.de>,
     Toerless Eckert <eckert@immd4.informatik.uni-erlangen.de>,
     Wayne Davison <davison@borland.com>,
     Patrick Wolfe <pat@kai.com, kailand!pat>,
     Bart Schaefer <schaefer@cse.ogi.edu>,
     Nathan Glasser <nathan@brokaw.lcs.mit.edu>,
     Larry W. Virden <lvirden@cas.org>,
     Howard Chu <hyc@hanauma.jpl.nasa.gov>,
     Tim MacKenzie <tym@dibbler.cs.monash.edu.au>,
     Markku Jarvinen <mta@{cc,cs,ee}.tut.fi>,
     Marc Boucher <marc@CAM.ORG>,
     Doug Siebert <dsiebert@isca.uiowa.edu>,
     Ken Stillson <stillson@tsfsrv.mitre.org>,
     Ian Frechett <frechett@spot.Colorado.EDU>,
     Brian Koehmstedt <bpk@gnu.ai.mit.edu>,
     Don Smith <djs6015@ultb.isc.rit.edu>,
     Frank van der Linden <vdlinden@fwi.uva.nl>,
     Martin Schweikert <schweik@cpp.ob.open.de>,
     David Vrona <dave@sashimi.lcu.com>,
     E. Tye McQueen <tye%spillman.UUCP@uunet.uu.net>,
     Matthew Green <mrg@eterna.com.au>,
     Christopher Williams <cgw@pobox.com>,
     Matt Mosley <mattm@access.digex.net>,
     Gregory Neil Shapiro <gshapiro@wpi.WPI.EDU>,
     Johannes Zellner <johannes@zellner.org>,
     Pablo Averbuj <pablo@averbuj.com>.

Availability
     The  latest  official  release  of  screen   available   via
     anonymous  ftp from ftp.gnu.org/gnu/screen/ or any other GNU
     distribution   site.   The   home   site   of   screen    is
     savannah.gnu.org/projects/screen/. If you want to help, send
     a note to screen-devel@gnu.org.

Bugs
     *  `dm' (delete mode) and `xs'  are  not  handled  correctly
        (they  are  ignored).  `xn'  is treated as a magic-margin
        indicator.

     *  Screen has no clue about double-high or double-wide char-
        acters. But this is the only area where vttest is allowed
        to fail.

     *  It is not possible to  change  the  environment  variable
        $TERMCAP  when  reattaching  under  a  different terminal
        type.

     *  The support of terminfo based systems  is  very  limited.
        Adding  extra  capabilities  to $TERMCAP may not have any
        effects.

     *  Screen does not make use of hardware tabs.

     *  Screen must be installed as set-uid with  owner  root  on
        most  systems in order to be able to correctly change the
        owner of the tty device file for  each  window.   Special
        permission  may  also  be  required  to  write  the  file
        "/etc/utmp".

     *  Entries in "/etc/utmp" are not  removed  when  screen  is
        killed with SIGKILL.  This will cause some programs (like
        "w" or "rwho") to advertise that a user is logged on  who
        really isn't.

     *  Screen may give a strange warning when your  tty  has  no
        utmp entry.

     *  When the modem line was hung up, screen may not automati-
        cally  detach  (or quit) unless the device driver is con-
        figured to send a HANGUP signal. To detach a screen  ses-
        sion use the -D or -d command line option.

     *  If a password is set, the command line options -d and  -D
        still detach a session without asking.

     *  Both "breaktype" and "defbreaktype" change the break gen-
        erating  method  used  by all terminal devices. The first
        should change a window specific setting, where the latter
        should change only the default for new windows.

     *  When  attaching  to  a  multiuser  session,  the   user's
        .screenrc  file is not sourced. Each user's personal set-
        tings have to be included  in  the  .screenrc  file  from
        which  the session is booted, or have to be changed manu-
        ally.

     *  A weird imagination is most useful to gain full advantage
        of all the features.

     *  Send bug-reports, fixes, enhancements,  t-shirts,  money,
        beer & pizza to screen-devel@gnu.org.
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