MOUNT(8)                             BSD                              MOUNT(8)



NAME
     mount, umount - mount and unmount file system

SYNOPSIS
     /etc/mount [-ravfp] [-t type] [-o [nfsoption|cdfsoption]]

     /etc/umount [-av] [-root] [fsys | dir]

DESCRIPTION
     The mount command mounts removable and remote file systems.

     The umount command unmounts removable and remote file systems.

     When mounting a removable file system located on a diskette, cartridge
     tape, or magtape, specify the device name for dev and a pre-existing
     directory pathname for dir.

     When mounting a remote file system (that is, one located on another
     host), specify the remote host and file system in the form host:fsname
     for fsys and a non-existent directory for dir if it is a single level
     mount.  (The mount command creates a gateway object named dir.)  Use an
     existing directory for dir if the file system is to be mounted
     hierarchically.

     Note:  You must have the nfs optional product installed in order to mount
     remote file systems.

     The mount and umount commands maintain a table of mounted file systems in
     /etc/mtab. If you execute the mount command without arguments, it prints
     the table.  If you specify only one argument, the command searches
     /etc/fstab for an entry with the same argument; if the entry exists, the
     command then uses it to mount the file system.

OPTIONS
     The command options can be one or more of the following items separated
     by a space:

     -a        With /etc/mount, try to mount all file systems listed in the
               file /etc/fstab.  (This file contains entries added manually by
               user.)

               With /etc/umount, try to unmount all file systems listed in
               /etc/mtab.  (This file contains an entry for every remote file
               system currently mounted by the local host.)

     -f        Fake a new /etc/mtab entry without mounting the file system
               (nfs only).

     -t type   Accept the following argument as the file system type; the
               recognized types are 4.3 for removable file systems, nfs for
               remote file systems (nfs only), and cdfs for CDROM devices.

     -o options
               Accept the following arguments, separated by commas, as
               options.  The defaults are fg, retry=1, timeo=3, and hard.  All
               of these options, except -vd, are nfs-only.

               bg          Retry in background if server host's mountd(8c)
                           doesn't respond.

               fg          Retry in foreground.

               hard        Retransmit until server responds.

               mtimeo=n    Set the mount timeout to n tenths of a second.

               port=n      Set NFS port number n.

               retrans=n   Set the number of NFS transmission retries (that
                           is, the number of attempts NFS will make to access
                           files in a mounted file system) to n.  There is no
                           ceiling on the number.  When used with the soft
                           option, the default is 4.

               retry=n     Set number of mount retries to n.

               ro          Allow read only.

               root        Mount in the global root directory.

               rsize=n     Set the read request buffer size to n bytes.

               rw          Allow read/write.

               soft        Report an error if server fails to respond.

               timeo=n     Set the NFS transmission timeout to n tenths of a
                           second.  When attempting to access the mounted file
                           system, NFS waits the specified amount of time for
                           response; if there is no response, NFS multiplies n
                           by 2 and retransmits the request.  There is a 60
                           second ceiling on the timeout.

               wsize=n     Set the write request buffer size to n bytes.

               vd=n        Specify the volume descriptor of a CDROM device.
                           Default value is zero, which indicates the Primary
                           Volume Descriptor.  This option is valid only in
                           conjunction with the -t cdfs option.

     -p        List the mounted file systems in the same format as entries in
               /etc/fstab (nfs only).

     -r        Mount the file system as read-only.

     -root     Unmount the file system in the global root directory.

     -v        Display a message when mounting the file system.

FILES
     /etc/mtab      mount table

     /etc/fstab     file system table

BUGS
     Note that physically write-protected file systems, as well as those on
     magnetic tape, must be mounted read-only.  If not, errors develop even if
     no explicit write is attempted.

     Mounting a removable file system that contains unreadable or otherwise
     invalid data can have unpredictable consequences.

SEE ALSO
     mount(2), fstab(5), mtab(5), mkdisk(8)