unmount file systems
-fv] special |
command calls the
system call to remove a
device or node
) from the file
system tree. Multiple devices and nodes may be specified on the command line.
If neither special
provided, the appropriate information is taken from the kernel.
The options are as follows:
- All of the file systems except root returned by
getmntinfo(3) are unmounted.
- 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.
- 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
- 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:
- Verbose, additional information is printed out as each file system is
umount command appeared in
Version 3 AT&T UNIX.