Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
UMOUNT(8)               FreeBSD 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
     system 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'' when
     run by root.

     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
             otherwise specified with the -t option, will only unmount NFS
             file systems.

     -t type
             Is used to indicate the actions should only be taken on file
             systems 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
             system 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 information.)

     /etc/fstab  file system table

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

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

FreeBSD 11.0-PRERELEASE          July 18, 2003         FreeBSD 11.0-PRERELEASE


Want to link to this manual page? Use this URL:

home | help