Manual Reference Pages - UMOUNT (8)
- unmount file systems
special ... | node ... | fsid ...
-a -| -A
utility calls the
system call to remove a file system from the file system tree.
The file system can be specified by its
device or remote node (rhost:path), the path to the mount point
or by the file system ID
as reported by
when run by root.
The options are as follows:
All the file systems described in
All the currently mounted file systems except
the root are unmounted.
file to use.
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.
For NFS, a forced dismount can take up to 1 minute or more to
complete against an unresponsive server and may throw away
data not yet written to the server for this case.
Also, doing a forced dismount of an NFSv3 mount when
is running is unsafe and can result in a crash.
Only file systems mounted from the specified host will be
This option implies the
option and, unless otherwise specified with the
option, will only unmount
Is used to indicate 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
to specify the file system types for which action should
For example, the
umount -a -t nfs,nullfs
unmounts all file systems of the type
that are listed in the
Verbose, additional information is printed out as each file system
If the environment variable
is set, all operations are performed against the specified file.
will not be honored if the process environment or memory address space is
for more information.)
file system table
utility appeared in
AT&T v6 .
Visit the GSP FreeBSD Man Page Interface.
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