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UMOUNT(8)                   System Manager's Manual                  UMOUNT(8)

NAME
     umount -- unmount filesystems

SYNOPSIS
     umount [-fvFR] [-t fstypelist] special | node
     umount -a [-fvF] [-h host] [-t fstypelist]

DESCRIPTION
     The umount command calls the unmount(2) system call to remove a special
     device or the remote node (rhost:path) from the filesystem tree at the
     point node.  If either special or node are not provided, the appropriate
     information is taken from the fstab(5) file.

     The options are as follows:

     -a      All the currently mounted filesystems except the root are
             unmounted.

     -f      The filesystem is forcibly unmounted.  Active special devices
             continue to work, but all other files return errors if further
             accesses are attempted.  The root filesystem cannot be forcibly
             unmounted.

     -F      Fake the unmount; perform all other processing but do not
             actually attempt the unmount.  (This is most useful in
             conjunction with -v, to see what umount would attempt to do).

     -R      Take the special | node argument as a path to be passed directly
             to unmount(2), bypassing all attempts to be smart about
             mechanically determining the correct path from the argument.
             This option is incompatible with any option that potentially
             unmounts more than one filesystem, such as -a, but it can be used
             with -f and/or -v.  This is the only way to unmount something
             that does not appear as a directory (such as a nullfs mount of a
             plain file); there are probably other cases where it is
             necessary.

     -h host
             Only filesystems mounted from the specified host will be
             unmounted.  This option is implies the -a option and, unless
             otherwise specified with the -t option, will only unmount NFS
             filesystems.

     -t fstypelist
             Is used to indicate the actions should only be taken on
             filesystems of the specified type.  More than one type may be
             specified in a comma separated list.  The list of filesystem
             types can be prefixed with ``no'' to specify the filesystem types
             for which action should not be taken.  For example, the umount
             command:

                   umount -a -t nfs,mfs

             unmounts all filesystems of the type NFS and MFS, whereas the
             umount command:

                   umount -a -t nonfs,mfs

             unmounts all file systems except those of type NFS and MFS.

     -v      Verbose, additional information is printed out as each filesystem
             is unmounted.

FILES
     /etc/fstab  filesystem table

SEE ALSO
     unmount(2), fstab(5), mount(8)

HISTORY
     A umount command appeared in Version 6 AT&T UNIX.

NetBSD 6.1.5                     May 17, 2009                     NetBSD 6.1.5