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

     umount -- unmount file systems

     umount [-fv] special | node | fsid
     umount -a | -A [-F fstab] [-fv] [-h host] [-t type]

     The umount utility calls the unmount(2) system call to remove a file sys-
     tem from the file system tree.  The file system can be specified by its
     special device or remote node (rhost:path), the path to the mount point
     node or by the file system ID fsid as reported by ``mount -v''.

     The options are as follows:

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

     -A      All the currently mounted file systems except the root are

     -F fstab
             Specify the fstab file to use.

     -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 file systems mounted from the specified host will be
             unmounted.  This option implies the -A option and, unless other-
             wise specified with the -t option, will only unmount NFS file

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

                   umount -a -t nfs,nullfs

             unmounts all file systems of the type NFS and NULLFS that are
             listed in the fstab(5) file.

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

     PATH_FSTAB  If the environment variable PATH_FSTAB is set, all operations
                 are performed against the specified file.  PATH_FSTAB will
                 not be honored if the process environment or memory address
                 space is considered ``tainted''.  (See issetugid(2) for more

     /etc/fstab  file system table

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

     A umount utility appeared in Version 6 AT&T UNIX.

BSD                              July 18, 2003                             BSD