UMOUNT(8) MidnightBSD System Manager’s Manual UMOUNT(8)

NAME

umount — unmount file systems

SYNOPSIS

umount [−fv] special | node | fsid
umount −a
| −A [−F fstab] [−fv] [−h host] [−t type]

DESCRIPTION

The umount utility calls the unmount(2) system call to remove a file system from the file system tree. The file system can be specified by its special device or remote node (rhost:path), the path to the mount point node or by the file system ID fsid as reported by ‘‘mount -v’’.

The options are as follows:

−a

All the file systems described in fstab(5) are unmounted.

−A

All the currently mounted file systems except the root are unmounted.

−F fstab

Specify the fstab file to use.

−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 file systems 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 file systems.

−t type

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 ‘‘no’’ to specify the file system types for which action should not be taken. For example, the umount command:

umount -a -t nfs,nullfs

unmounts all file systems of the type NFS and NULLFS that are listed in the fstab(5) file.

−v

Verbose, additional information is printed out as each file system is unmounted.

ENVIRONMENT
PATH_FSTAB

If the environment variable PATH_FSTAB is set, all operations are performed against the specified file. PATH_FSTAB will not be honored if the process environment or memory address space is considered ‘‘tainted’’. (See issetugid(2) for more information.)

FILES
/etc/fstab

file system table

SEE ALSO

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

HISTORY

A umount utility appeared in Version 6 AT&T UNIX.

MidnightBSD 0.3 July 18, 2003 MidnightBSD 0.3