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

     umount - unmount file systems

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

     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

     -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.

     /etc/fstab  file system table

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

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

OpenBSD 3.6                    February 20, 1994                             1