umount - unmount file systems
umount [-fv] special | node
umount -a [-fv] [-h host] [-t ufs | lfs | external_type]
The umount command calls the unmount(2) system call to remove a special
device or the remote node (rhost:path) from the file system
tree at the
point node. If neither special nor node are provided, the
information is taken from the fstab(5) file.
The options are as follows:
-a All of the file systems described in fstab(5) are
-f The file system is forcibly unmounted. Active special devices
continue to work, but all other files return errors
accesses are attempted. The root file system cannot
Only filesystems mounted from the specified host
will be unmounted.
This option implies the -a option and, unless
specified with the -t option, will only unmount NFS
-t ufs | lfs | external type
Is used to indicate the actions should only be taken
of the specified type. More than one type may
in a comma separated list. The list of filesystem
types can be
prefixed with ``no'' to specify the filesystem types
action should not be taken. For example, the umount
# umount -a -t nfs,mfs
umounts all filesystems of the type NFS and MFS.
-v Verbose, additional information is printed out as
each file system
/etc/fstab file system table
unmount(2), fstab(5), mount(8)
A umount command appeared in Version 3 AT&T UNIX.
OpenBSD 3.6 February 20, 1994
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