umount man page

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

NAME

     umount -- unmount file systems

SYNOPSIS

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

DESCRIPTION

     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
             unmounted.

     -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
             unmounted.

     -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
             systems.

     -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.

ENVIRONMENT

     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.)

FILES

     /etc/fstab  file system table

SEE ALSO

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

HISTORY

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

FreeBSD 6.2                      July 18, 2003                     FreeBSD 6.2

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