umount(8) BSD System Manager's Manual 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 list of filesystems provided by
 getfsent(3) .
 The options are as follows:
 -a All the filesystems described via getfsent(3)  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 implies the -A option and, unless other-
 wise specified with the -t option, will only unmount NFS filesys-
 tems.
 -t type
 Is used to indicate the actions should only be taken on filesys-
 tems 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,hfs
 umounts all filesystems of the type NFS and HFS.
 -v Verbose, additional information is printed out as each filesystem
 is unmounted.

NOTES

 Due to the complex and interwoven nature of Mac OS X, umount may fail
 often. It is recommended that diskutil(1) (as in, ``diskutil unmount
 /mnt'') be used instead.

SEE ALSO

 unmount(2) , getfsent(3) , mount(8) , diskutil(1)

HISTORY

 A umount command appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution May 8, 1995 4th Berkeley Distribution