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UMOUNT
!!!UMOUNT
NAME
SYNOPSIS
DESCRIPTION
THE LOOP DEVICE
FILES
SEE ALSO
HISTORY
----
!!NAME


umount - unmount file systems
!!SYNOPSIS


__umount [[-hV]__


__umount -a [[-dflnrv] [[-t__ ''vfstype''__]
umount [[-dflnrv]__ ''dir'' __|__ ''device''
__[[...]__
!!DESCRIPTION


The __umount__ command detaches the file system(s)
mentioned from the file hierarchy. A file system is
specified by giving the directory where it has been mounted.
Giving the special device on which the file system lives may
also work, but is obsolete, mainly because it will fail in
case this device was mounted on more than one
directory.


Note that a file system cannot be unmounted when it is
`busy' - for example, when there are open files on it, or
when some process has its working directory there, or when a
swap file on it is in use. The offending process could even
be __umount__ itself - it opens libc, and libc in its
turn may open for example locale files. A lazy unmount
avoids this problem.


Options for the __umount__ command:


__-V__


Print version and exit.


__-h__


Print help message and exit.


__-v__


Verbose mode.


__-n__


Unmount without writing in ''/etc/mtab''.


__-r__


In case unmounting fails, try to remount
read-only.


__-d__


In case the unmounted device was a loop device, also free
this loop device.


__-a__


All of the file systems described in ''/etc/mtab'' are
unmounted. (With __umount__ version 2.7 and later: the
''proc'' filesystem is not unmounted.)


__-t__ ''vfstype''


Indicate that 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 on which no action should be
taken.


__-f__


Force unmount (in case of an unreachable NFS system).
(Requires kernel 2.1.116 or later.)


__-l__


Lazy unmount. Detach the filesystem from the filesystem
hierarchy now, and cleanup all references to the filesystem
as soon as it is not busy anymore. (Requires kernel 2.4.11
or later.)
!!THE LOOP DEVICE


The __umount__ command will free the loop device (if any)
associated with the mount, in case it finds the option
`loop=...' in ''/etc/mtab'', or when the -d option was
given. Any pending loop devices can be freed using `losetup
-d', see losetup(8).
!!FILES


''/etc/mtab'' table of mounted file systems
!!SEE ALSO


umount(2), mount(8),
losetup(8).
!!HISTORY


A __umount__ command appeared in Version 6 AT
__
----

10 pages link to umount(8):

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Last edited on Tuesday, June 4, 2002 12:31:21 am by "perry"

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