1.\" Copyright (c) 1980, 1989, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)umount.8 8.2 (Berkeley) 5/8/95 33.\" $FreeBSD$ 34.\" 35.Dd May 8, 1995 36.Dt UMOUNT 8 37.Os 38.Sh NAME 39.Nm umount 40.Nd unmount file systems 41.Sh SYNOPSIS 42.Nm 43.Op Fl fv 44.Ar special \&| node 45.Nm 46.Fl a | A 47.Op Fl fv 48.Op Fl h Ar host 49.Op Fl t Ar type 50.Sh DESCRIPTION 51The 52.Nm 53utility calls the 54.Xr unmount 2 55system call to remove a 56.Ar "special device" 57or the remote node (rhost:path) from the file system tree at the point 58.Ar node . 59If either 60.Ar special 61or 62.Ar node 63are not provided, the appropriate information is taken from the 64.Xr fstab 5 65file. 66.Pp 67The options are as follows: 68.Bl -tag -width indent 69.It Fl a 70All the file systems described in 71.Xr fstab 5 72are unmounted. 73.It Fl A 74All the currently mounted file systems except 75the root are unmounted. 76.It Fl f 77The file system is forcibly unmounted. 78Active special devices continue to work, 79but all other files return errors if further accesses are attempted. 80The root file system cannot be forcibly unmounted. 81.It Fl h Ar host 82Only file systems mounted from the specified host will be 83unmounted. 84This option implies the 85.Fl A 86option and, unless otherwise specified with the 87.Fl t 88option, will only unmount 89.Tn NFS 90file systems. 91.It Fl t Ar type 92Is used to indicate the actions should only be taken on 93file systems of the specified type. 94More than one type may be specified in a comma separated list. 95The list of file system types can be prefixed with 96.Dq no 97to specify the file system types for which action should 98.Em not 99be taken. 100For example, the 101.Nm 102command: 103.Bd -literal -offset indent 104umount -a -t nfs,nullfs 105.Ed 106.Pp 107unmounts all file systems of the type 108.Tn NFS 109and 110.Tn NULLFS 111that are listed in the 112.Xr fstab 5 113file. 114.It Fl v 115Verbose, additional information is printed out as each file system 116is unmounted. 117.El 118.Sh FILES 119.Bl -tag -width /etc/fstab -compact 120.It Pa /etc/fstab 121file system table 122.El 123.Sh SEE ALSO 124.Xr unmount 2 , 125.Xr fstab 5 , 126.Xr mount 8 127.Sh HISTORY 128A 129.Nm 130utility appeared in 131.At v6 . 132