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tftp(1)

Name
     tftp - trivial file transfer program

Synopsis
     tftp [host [port]]

Description
     tftp is the user interface to  the  Internet  TFTP  (Trivial
     File  Transfer  Protocol),  which  allows  users to transfer
     files to and from a remote  machine.  The  remote  host  and
     optional port may be specified on the command line, in which
     case tftp uses host as the default host, and  if  specified,
     port as the default port, for future transfers. See the con-
     nect command below.

Usage
     Once tftp is running, it issues the prompt tftp> and  recog-
     nizes the following commands:

  Commands
     connect host-name [ port ]
         Set the host, and optionally port,  for  transfers.  The
         TFTP  protocol,  unlike the FTP protocol, does not main-
         tain connections between transfers;  thus,  the  connect
         command  does  not  actually  create  a  connection, but
         merely remembers what host is to be used for  transfers.
         You  do  not have to use the connect command; the remote
         host can be specified as part of the  get  or  put  com-
         mands.


     mode transfer-mode
         Set the mode for transfers; transfer-mode may be one  of
         ascii or binary. The default is ascii.


     put filename
     put localfile remotefile
     put filename1 filename2 ... filenameN remote-directory
         Transfer a file, or a set of  files,  to  the  specified
         remote  file or directory. The destination can be in one
         of two forms: a filename on the remote host if the  host
         has already been specified, or a string of the form:

           host:filename

         to specify both a host and filename at the same time. If
         the  latter form is used, the specified host becomes the
         default for future transfers.  If  the  remote-directory
         form  is  used, the remote host is assumed to be running
         the UNIX system.

         The host can be a host name (see hosts(4)) or an IPv4 or
         IPv6  address  string (see inet(7P) or inet6(7P)). Since
         IPv6 addresses already contain ":"s, the host should  be
         enclosed  in  square  brackets  when  an IPv6 address is
         used. Otherwise, the first occurrence of a colon will be
         interpreted  as  the  separator between the host and the
         filename. For example,

           [1080::8:800:200c:417A]:myfile

         Files may be written only if they already exist and  are
         publicly writable. See in.tftpd(1M).


     get filename
     get remotename localname
     get filename1 filename2 filename3 ... filenameN
         Get a file or set of files  (three  or  more)  from  the
         specified  remote  sources.  source can be in one of two
         forms: a filename on the remote host  if  the  host  has
         already been specified, or a string of the form:

           host:filename

         to specify both a host and filename at the same time. If
         the latter form is used, the last host specified becomes
         the default for future transfers. See  the  put  command
         regarding specifying a host.


     quit
         Exit tftp. An EOF also exits.


     verbose
         Toggle verbose mode.


     trace
         Toggle packet tracing.


     status
         Show current status.

     rexmtretransmission-timeout
         Set the per-packet retransmission timeout, in seconds.


     timeouttotal-transmission-timeout
         Set the total transmission timeout, in seconds.


     ascii
         Shorthand for mode ascii.


     binary
         Shorthand for mode binary.


     blksize transfer-blocksize
         The value of the transfer blocksize option to  negotiate
         with  the  server. A value of 0 disables the negotiation
         of this option.


     srexmt server-retransmission-timeout
         The  value  of  the  retransmission  timeout  option  to
         request  that the server uses. A value of 0 disables the
         negotiation of this option.


     tsize
         A toggle that sends the  transfer  size  option  to  the
         server. By default, the option is not sent. The transfer
         size option is not sent with a write  request  when  the
         transfer-mode is ascii.


     ? [ command-name ... ]
         Print help information.

Attributes
     See attributes(5) for descriptions of the  following  attri-
     butes:



     tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i)  ATTRI-
     BUTE TYPEATTRIBUTE VALUE _ Availabilityservice/network/tftp

See Also
     in.tftpd(1M), hosts(4), attributes(5),inet(7P), inet6(7P)


     Malkin, G. and Harkin, A. RFC 2347, TFTP  Option  Extension.
     The Internet Society. May 1998


     Malkin, G. and Harkin, A. RFC 2348, TFTP  Blocksize  Option.
     The Internet Society. May 1998


     Malkin, G. and Harkin, A. RFC 2349,  TFTP  Timeout  Interval
     and Transfer Size Options. The Internet Society. May 1998


     Sollins, K.R. RFC 1350, The TFTP Protocol (Revision 2). Network
     Working Group. July 1992.

Notes
     The default transfer-mode is ascii. This differs  from  pre-
     SunOS 4.0 and pre-4.3BSD systems, so explicit action must be
     taken when transferring non-ASCII binary files such as  exe-
     cutable commands.


     Because there is no user-login or validation within the TFTP
     protocol,  many remote sites restrict file access in various
     ways. Approved methods for file access are specific to  each
     site, and therefore cannot be documented here.


     When using the get command to transfer multiple files from a
     remote  host,  three or more files must be specified. If two
     files are specified, the second file  is  used  as  a  local
     file.


     With the default block size of 512 octets and a 16-bit block
     counter,  some TFTP implementations might have problems with
     files over 33,553,919 octets (513 octets short of  32MB)  in
     size.  The  Solaris  implementation can transfer files up to
     4GB in size.


     By default, the Solaris TFTP  client  does  not  enable  the
     blocksize  or  transfer  size options. Setting the blocksize
     option to a higher value is sometimes useful as a workaround
     when dealing with peers that have a 32MB limit.
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