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

NAME
     umount - unmount file systems

SYNOPSIS
     umount [-fv] special | node
     umount -a [-fv] [-h host] [-t ufs | lfs | external_type]

DESCRIPTION
     The umount command calls the unmount(2) system call to remove a special
     device or the remote node (rhost:path) from the file system tree at the
     point node.  If neither special nor node are provided, the appropriate
     information is taken from the fstab(5) file.

     The options are as follows:

     -a      All of the file systems described in fstab(5) are unmounted.

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

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

     -t ufs | lfs | external type
             Is used to indicate the actions should only be taken on filesys-
             tems 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

             umounts all filesystems of the type NFS and MFS.

     -v      Verbose, additional information is printed out as each file sys-
             tem is unmounted.

FILES
     /etc/fstab  file system table

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

HISTORY
     A umount command appeared in Version 3 AT&T UNIX.

OpenBSD 3.6                    February 20, 1994                             1