umount(8)
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UMOUNT(8) NetBSD System Manager's Manual UMOUNT(8)
NAME
umount - unmount filesystems
SYNOPSIS
umount [-fvFR] special | node
umount -a | -A [-fvFR] [-h host] [-t type]
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 filesystems described in fstab(5) are unmounted.
-A All the currently mounted filesystems except the root are un-
mounted.
-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 actual-
ly 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 mechani-
cally determining the correct path from the argument. This op-
tion is incompatible with any option that potentially umounts
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 unmount-
ed. This option is implies the -A option and, unless otherwise
specified with the -t option, will only unmount NFS filesystems.
-t type
Is used to indicate the actions should only be taken on filesys-
tems 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
umounts 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.
4th Berkeley Distribution May 8, 1995 2
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