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UMOUNT(8) NetBSD System Manager's Manual UMOUNT(8)
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umount -- unmount filesystems
umount [-fvFR] [-t fstypelist] special | node
umount -a [-fvF] [-h host] [-t fstypelist]
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
-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
-F Fake the unmount; perform all other processing but do not actu-
ally 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
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.
Only filesystems mounted from the specified host will be
unmounted. This option is implies the -a option and, unless oth-
erwise specified with the -t option, will only unmount NFS
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
unmounts all filesystems of the type NFS and MFS.
-v Verbose, additional information is printed out as each filesystem
/etc/fstab filesystem table
unmount(2), fstab(5), mount(8)
A umount command appeared in Version 6 AT&T UNIX.
NetBSD 5.0 April 21, 2004 NetBSD 5.0