Section 2: umount
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UMOUNT(8) Linux Programmer's Manual UMOUNT(8)
NAME
umount - unmount file systems
SYNOPSIS
umount [-hV]
umount -a [-nrv] [-t vfstype]
umount [-nrv] device | dir [...]
DESCRIPTION
The umount command detaches the file system(s) mentioned
from the file hierarchy. A file system is specified
either by giving the directory where it has been mounted,
or by giving the special device on which it lives.
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.
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.
-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 sys-
tem). (Requires kernel 2.1.116 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. Any pending loop devices can be
Linux 2.0 26 July 1997 1
UMOUNT(8) Linux Programmer's Manual UMOUNT(8)
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&T UNIX.
Linux 2.0 26 July 1997 2