UMOUNT(8)

NAME
umount - unmount filesystems

SYNOPSIS
umount [-fv] special | node
umount -a | -A [-fv] [-h host] [-t type]

DESCRIPTION
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 filesystems described in fstab(5) are unmounted.

-A  All the currently mounted filesystems except the root are unmounted.

-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 unmounted.

-h host
    Only filesystems mounted from the specified host will be unmounted. This option is implies the -A option and, unless otherwise specified with the -t option, will only unmount NFS filesystems.

-t type
    Is used to indicate the 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 umount command:

        umount -a -t nfs,mfs

    umounts all filesystems of the type NFS and MFS.

-v  Verbose, additional information is printed out as each filesystem is unmounted.

FILES
/etc/fstab
    filesystem table

SEE ALSO
unmount(2), fstab(5), mount(8)

HISTORY
A umount command appeared in AT&T UNIX.