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NetBSD 6.1.5 - man page for umount (netbsd section 8)

UMOUNT(8)			   BSD System Manager's Manual				UMOUNT(8)

     umount -- unmount filesystems

     umount [-fvFR] [-t fstypelist] special | node
     umount -a [-fvF] [-h host] [-t fstypelist]

     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 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 filesys-
	     tem cannot be forcibly unmounted.

     -F      Fake the unmount; perform all other processing but do not actually attempt the
	     unmount.  (This is most useful in conjunction with -v, to see what umount would
	     attempt to do).

     -R      Take the special | node argument as a path to be passed directly to unmount(2),
	     bypassing all attempts to be smart about mechanically determining the correct path
	     from the argument.  This option is incompatible with any option that potentially
	     unmounts more than one filesystem, such as -a, but it can be used with -f and/or -v.
	     This is the only way to unmount something that does not appear as a directory (such
	     as a nullfs mount of a plain file); there are probably other cases where it is nec-

     -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 fstypelist
	     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

	     unmounts all filesystems of the type NFS and MFS, whereas the umount command:

		   umount -a -t nonfs,mfs

	     unmounts all file systems except those of type NFS and MFS.

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

     /etc/fstab  filesystem table

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

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

BSD					   May 17, 2009 				      BSD

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