UMOUNT(8) OpenBSD System Manager's Manual UMOUNT(8)NAMEumount - unmount file systems
SYNOPSISumount [-fv] special | node
umount-a [-fv] [-h host] [-t type]
DESCRIPTION
The umount command calls the unmount(2) system call to remove a special
device or node ([rhost:] path) from the file system tree. Multiple
devices and nodes may be specified on the command line. If neither
special nor node are provided, the appropriate information is taken from
the kernel.
The options are as follows:
-a All of the file systems except root returned by getmntinfo(3) are
unmounted.
-f The file system is forcibly unmounted. Active special devices
continue to work, but all other files return errors if further
accesses are attempted. The root file system cannot be forcibly
unmounted.
-h host
Only filesystems mounted from the specified host will be
unmounted. This option implies the -a option and, unless
otherwise specified with the -t option, will only unmount NFS
filesystems.
-t type
Indicates that 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 following command unmounts
all filesystems of type NFS and MFS:
# umount-a -t nfs,mfs
-v Verbose, additional information is printed out as each file
system is unmounted.
SEE ALSOunmount(2), getmntinfo(3), mount(8)HISTORY
A umount command appeared in Version 3 AT&T UNIX.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9
