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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 un-

     -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

     -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 op-
	     tion 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 un-
	     mounted.  This option is implies the -a option and, unless	other-
	     wise specified with the -t	option,	will only unmount NFS filesys-

     -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 ac-
	     tion 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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