NAME
umount
- unmount filesystems
SYNOPSIS
umount
[-fvFR]
[-t fstypelist]
special | node
umount
-a
[-fvF]
[-h host]
[-t fstypelist]
DESCRIPTION
The
umount
command
calls the
unmount(2)
system call to remove a
special device
or the remote node (rhost:path) from the filesystem tree at the point
node.
If either
special
or
node
are not provided, the appropriate information is taken from the
fstab(5)
file.
The options are as follows:
- -a
-
All the currently mounted filesystems except the root are unmounted.
- -f
-
The filesystem is forcibly unmounted.
Active special devices continue to work,
but all other files return errors if further accesses are attempted.
The root filesystem cannot be forcibly unmounted.
- -F
-
Fake the unmount; perform all other processing but do not actually
attempt the unmount.
(This is most useful in conjunction with
-v,
to see what
umount
would attempt to do).
- -R
-
Take the
special | node
argument as a path to be passed directly to
unmount(2),
bypassing all attempts to be smart about mechanically determining the
correct path from the argument.
This option is incompatible with any option that potentially unmounts
more than one filesystem, such as
-a,
but it can be used with
-f
and/or
-v.
This is the only way to unmount something that does not appear as a
directory (such as a nullfs mount of a plain file); there are probably
other cases where it is necessary.
- -h host
-
Only filesystems mounted from the specified host will be
unmounted.
This option is implies the
-a
option and, unless otherwise specified with the
-t
option, will only unmount NFS filesystems.
- -t fstypelist
-
Is used to indicate the actions should only be taken on
filesystems of the specified type.
More than one type may be specified in a comma separated list.
The list of filesystem types can be prefixed with
``no''
to specify the filesystem types for which action should
not
be taken.
For example, the
umount
command:
-
umount -a -t nfs,mfs
unmounts all filesystems of the type
NFS
and
MFS.
- -v
-
Verbose, additional information is printed out as each filesystem
is unmounted.
FILES
/etc/fstab
-
filesystem table
SEE ALSO
unmount(2),
fstab(5),
mount(8)
HISTORY
A
umount
command appeared in
Version 6 AT&T UNIX
.