mount, umount - mount or unmount  file  systems  and  remote


     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...]


     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 dev-
     ice 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

     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 arguments, 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  argu-
     ments. 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  sys-
     tem   type   is   determined  by  the  first  entry  in  the
     /etc/dfs/fstypes file.  After filling in missing  arguments,
     mount will invoke the FSType-specific mount module.

     Only a super-user can mount or unmount  file  systems  using
     mount  and  umount.  However, any user can use mount to list
     mounted file systems and resources.


     -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  consulting  /etc/default/fs   or

     -a [ mount_points. . . ]
           Perform mount or umount operations in  parallel,  when

           If mount points are not specified,  mount  will  mount
           all  file  systems  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 system
           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 sys-
           tem  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 sys-
           tem 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 for-
           mat. 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  com-
           mand line.

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

           -m    Mount the file system without making an entry in

           -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.

           -O    Overlay mount.  Allow  the  file  system  to  be
                 mounted over an existing mount point, making the
                 underlying file system inaccessible. 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.


     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).


           Table of mounted file systems.

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

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

           List of default parameters for each file system.


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

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Availability                | SUNWcsu                     |


     mount_cachefs(1M),      mount_hsfs(1M),       mount_nfs(1M),
     mount_pcfs(1M),        mount_tmpfs(1M),       mount_ufs(1M),
     mountall(1M), umountall(1M),  mnttab(4),  vfstab(4),  attri-
     butes( 5), largefile(5), lofs(7FS), pcfs(7FS)


     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.


     The mount -p output is incorrect for cachefs.

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