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mount(1m)

System Administration Commands                                       mount(1M)



NAME
       mount, umount - mount or unmount file systems and remote resources

SYNOPSIS
       mount [-p | -v]


       mount [-F FSType] [generic_options] [-o specific_options]
            [-O] special | mount_point


       mount [-F FSType] [generic_options] [-o specific_options]
            [-O] special mount_point


       mount -a [-F FSType] [-V] [current_options]
            [-o specific_options] [mount_point]...


       umount [-f] [-V] [-o specific_options] special | mount_point


       umount -a [-f] [-V] [-o specific_options] [mount_point]...


DESCRIPTION
       mount  attaches  a  file  system  to  the  file system hierarchy at the
       mount_point, which is the pathname of a directory. If  mount_point  has
       any  contents  prior to the mount operation, these are hidden until the
       file system is unmounted.


       umount unmounts a currently mounted file system, which may be specified
       either  as  a  mount_point  or as special, the device on which the file
       system resides.


       The table of currently mounted file systems can be found  by  examining
       the  mounted  file  system information file. This is provided by a file
       system that is usually mounted on /etc/mnttab. The mounted file  system
       information  is  described in mnttab(4). Mounting a file system adds an
       entry to the mount table; a umount removes an entry from the table.


       When invoked with both the special and mount_point arguments and the -F
       option,  mount  validates  all arguments except for special and invokes
       the appropriate FSType-specific mount module. If invoked with no  argu‐
       ments,  mount  lists all the mounted file systems recorded in the mount
       table, /etc/mnttab. If invoked with a partial argument list (with  only
       one  of  special  or  mount_point,  or with both special or mount_point
       specified but not FSType), mount will search /etc/vfstab for  an  entry
       that  will  supply the missing arguments. If no entry is found, and the
       special argument starts with /, the  default  local  file  system  type
       specified in /etc/default/fs will be used. Otherwise the default remote
       file system type will be used. The default remote file system  type  is
       determined by the first entry in the /etc/dfs/fstypes file. After fill‐
       ing in missing arguments, mount will invoke the  FSType-specific  mount
       module.


       For  file  system types that support it, a file can be mounted directly
       as a file system by specifying the full path to the file as the special
       argument.  In  such  a case, the nosuid option is enforced. If specific
       file system support for such loopback file mounts is not  present,  you
       can  still  use lofiadm(1M) to mount a file system image. In this case,
       no special options are enforced.


       Only a user with sufficient privilege  (at  least  PRIV_SYS_MOUNT)  can
       mount or unmount file systems using mount and umount. However, any user
       can use mount to list mounted file systems and resources.

OPTIONS
       -F FSType

           Used to specify the FSType on which to operate. The FSType must  be
           specified  or must be determinable from /etc/vfstab, or by consult‐
           ing /etc/default/fs or /etc/dfs/fstypes.


       -a [ mount_points. . . ]

           Perform mount or umount operations in parallel, when possible.

           If mount points are not specified, mount will mount all  file  sys‐
           tems  whose  /etc/vfstab  "mount  at  boot"  field is yes. If mount
           points are specified, then /etc/vfstab "mount at boot"  field  will
           be ignored.

           If  mount points are specified, umount will only umount those mount
           points. If none is specified, then umount will attempt  to  unmount
           all file systems in /etc/mnttab, with the exception of certain sys‐
           tem required file  systems:  /,  /usr,  /var,  /var/adm,  /var/run,
           /proc, /dev/fd and /tmp.


       -f

           Forcibly unmount a file system.

           Without  this  option,  umount  does  not allow a file system to be
           unmounted if a file on the file system is busy. Using  this  option
           can  cause  data  loss  for open files; programs which access files
           after the file system has been unmounted will get an error (EIO).


       -p

           Print the list of mounted file systems in the  /etc/vfstab  format.
           Must be the only option specified. See BUGS.


       -v

           Print  the  list of mounted file systems in verbose format. Must be
           the only option specified.


       -V

           Echo the complete command line, but do  not  execute  the  command.
           umount  generates a command line by using the options and arguments
           provided by the user and adding to them  information  derived  from
           /etc/mnttab.  This option should be used to verify and validate the
           command line.


       generic_options

           Options that are commonly supported by most FSType-specific command
           modules. The following options are available:

           -m

               Mount the file system without making an entry in /etc/mnttab.


           -g

               Globally  mount  the  file  system. On a clustered system, this
               globally mounts the file system on all nodes of the cluster. On
               a non-clustered system this has no effect.


           -o

               Specify  FSType-specific  options in a comma separated (without
               spaces) list of  suboptions  and  keyword-attribute  pairs  for
               interpretation  by  the  FSType-specific module of the command.
               (See mount_ufs(1M).) When you use -o with a  file  system  that
               has an entry in /etc/vfstab, any mount options entered for that
               file system in /etc/vfstab are ignored.

               The following options are supported:

               devices | nodevices

                   Allow or disallow the opening of device-special files.  The
                   default is devices.

                   If you use nosuid in conjunction with devices, the behavior
                   is equivalent to that of nosuid.


               exec | noexec

                   Allow or disallow executing programs in  the  file  system.
                   Allow  or  disallow mmap(2) with PROT_EXEC for files within
                   the file system. The default is exec.


               loop

                   Ignored for compatibility.


               nbmand | nonbmand

                   Allow or disallow non-blocking mandatory locking  semantics
                   on this file system. Non-blocking mandatory locking is dis‐
                   allowed by default.

                   If the file system is mounted with the nbmand option,  then
                   applications  can  use the fcntl(2) interface to place non-
                   blocking mandatory locks on files and the  system  enforces
                   those  semantics.  If  you enable this option, it can cause
                   standards conformant applications to see unexpected errors.

                   To avoid the possibility of obtaining  mandatory  locks  on
                   system files, do not use the nbmand option with the follow‐
                   ing file systems:

                     /
                     /usr
                     /etc
                     /var
                     /proc
                     /dev
                     /devices
                     /system/contract
                     /system/object
                     /etc/mnttab
                     /etc/dfs/sharetab


                   Do not use the remount option to change the nbmand disposi‐
                   tion  of  the  file  system.  The nbmand option is mutually
                   exclusive of the global option. See -g.


               ro | rw

                   Specify read-only or read-write. The default is rw.


               setuid | nosetuid

                   Allow or disallow setuid or setgid execution.  The  default
                   is setuid.

                   If  you  specify  setuid  in  conjunction  with nosuid, the
                   behavior is the same as nosuid.

                   nosuid is equivalent to nosetuid and nodevices.  When  suid
                   or  nosuid  is combined with setuid or nosetuid and devices
                   or nodevices, the most restrictive options take effect.

                   This option is highly recommended whenever the file  system
                   is  shared by way of NFS with the root= option. Without it,
                   NFS clients could add setuid programs to the server or cre‐
                   ate devices that could open security holes.


               suid | nosuid

                   Allow  or  disallow setuid or setgid execution. The default
                   is suid. This option also allows or disallows  opening  any
                   device-special entries that appear within the filesystem.

                   nosuid  is  equivalent to nosetuid and nodevices. When suid
                   or nosuid is combined with setuid or nosetuid  and  devices
                   or nodevices, the most restrictive options take effect.

                   This  option is highly recommended whenever the file system
                   is shared using NFS with the root=option, because,  without
                   it, NFS clients could add setuid programs to the server, or
                   create devices that could open security holes.


               rstchown | norstchown

                   Allow or disallow restricted chown. If the file  system  is
                   mounted  with  rstchown, the owner of the file is prevented
                   from changing the owner ID  of the file. If the file system
                   is  mounted  with norstchown, the user can permit ownership
                   changes for files they own. Only the super-user or  a  user
                   with  appropriate   privilege  can arbitrarily change owner
                   IDs.



           -O

               Overlay mount. Allow the file system  to  be  mounted  over  an
               existing  mount  point, making the underlying file system inac‐
               cessible. If a mount is attempted on a pre-existing mount point
               without  setting  this flag, the mount will fail, producing the
               error "device busy".


           -r

               Mount the file system read-only.



EXAMPLES
       Example 1 Mounting and Unmounting a DVD Image Directly


       The following commands mount and unmount a DVD image.


         # mount -F hsfs /images/solaris.iso /mnt/solaris-image
         # umount /mnt/solaris-image



USAGE
       See largefile(5) for the description  of  the  behavior  of  mount  and
       umount  when encountering files greater than or equal to 2 Gbyte ( 2^31
       bytes).

FILES
       /etc/mnttab

           Table of mounted file systems.


       /etc/default/fs

           Default local file system type. Default values can be set  for  the
           following flags in /etc/default/fs. For example: LOCAL=ufs

           LOCAL:

               The default partition for a command if no FSType is specified.



       /etc/vfstab

           List of default parameters for each file system.


ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:




       tab()   box;   cw(2.75i)  |cw(2.75i)  lw(2.75i)  |lw(2.75i)  ATTRIBUTE
       TYPEATTRIBUTE VALUE _ Availabilitysystem/core-os


SEE ALSO
       lofiadm(1M),     mount_hsfs(1M),     mount_nfs(1M),     mount_pcfs(1M),
       mount_smbfs(1M),    mount_tmpfs(1M),    mount_udfs(1M),  mount_ufs(1M),
       mountall(1M), umountall(1M), fcntl(2), mmap(2),  mnttab(4),  vfstab(4),
       attributes(5), largefile(5), privileges(5), lofs(7FS), pcfs(7FS)

NOTES
       If  the directory on which a file system is to be mounted is a symbolic
       link, the file system is mounted on the directory to which the symbolic
       link refers, rather than on top of the symbolic link itself.



SunOS 5.11                        17 Feb 2014                        mount(1M)
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