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

NAME
     umount — unmount filesystems

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

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 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.

     -F	     Fake the unmount; perform all other processing but do not actu‐
	     ally 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 mechani‐
	     cally 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 necessary.

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

     -t fstypelist
	     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,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.

FILES
     /etc/fstab	 filesystem table

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

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

BSD				 May 17, 2009				   BSD

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