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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)umount.8 8.2 (Berkeley) 5/8/95 29.\" $FreeBSD: src/sbin/umount/umount.8,v 1.7.2.3 2001/12/14 15:17:57 ru Exp $ 30.\" 31.Dd September 29, 2016 32.Dt UMOUNT 8 33.Os 34.Sh NAME 35.Nm umount 36.Nd unmount filesystems 37.Sh SYNOPSIS 38.Nm 39.Op Fl fv 40.Ar special \&| node 41.Nm 42.Fl a | A 43.Op Fl F Ar fstab 44.Op Fl fv 45.Op Fl h Ar host 46.Op Fl t Ar type 47.Sh DESCRIPTION 48The 49.Nm 50command 51calls the 52.Xr unmount 2 53system call to remove a 54.Ar "special device" 55or the remote node (rhost:path) from the filesystem tree at the point 56.Ar node . 57If either 58.Ar special 59or 60.Ar node 61are not provided, the appropriate information is taken from the 62.Xr fstab 5 63file. 64.Pp 65The options are as follows: 66.Bl -tag -width indent 67.It Fl a 68All the filesystems described in 69.Xr fstab 5 70are unmounted. 71.It Fl A 72All the currently mounted filesystems except 73the root are unmounted. 74.It Fl F Ar fstab 75Specify the 76.Pa fstab 77file to use. 78.It Fl f 79The filesystem is forcibly unmounted. 80Active special devices continue to work, 81but all other files return errors if further accesses are attempted. 82The root filesystem cannot be forcibly unmounted. 83.It Fl h Ar host 84Only filesystems mounted from the specified host will be 85unmounted. 86This option implies the 87.Fl A 88option and, unless otherwise specified with the 89.Fl t 90option, will only unmount 91.Tn NFS 92filesystems. 93.It Fl t Ar type 94Is used to indicate the actions should only be taken on 95filesystems of the specified type. 96More than one type may be specified in a comma separated list. 97The list of filesystem types can be prefixed with 98.Dq no 99to specify the filesystem types for which action should 100.Em not 101be taken. 102For example, the 103.Nm 104command: 105.Bd -literal -offset indent 106umount -a -t nfs,mfs 107.Ed 108.Pp 109unmounts all filesystems of the type 110.Tn NFS 111and 112.Tn MFS 113that are listed in the 114.Xr fstab 5 115file. 116.It Fl v 117Verbose, additional information is printed out as each filesystem 118is unmounted. 119.El 120.Sh ENVIRONMENT 121.Bl -tag -width PATH_FSTAB 122.It Pa PATH_FSTAB 123If the environment variable 124.Pa PATH_FSTAB 125is set all operations are performed against the specified file. 126.El 127.Sh FILES 128.Bl -tag -width /etc/fstab -compact 129.It Pa /etc/fstab 130filesystem table 131.El 132.Sh SEE ALSO 133.Xr unmount 2 , 134.Xr fstab 5 , 135.Xr mount 8 136.Sh HISTORY 137A 138.Nm 139command appeared in 140.At v1 . 141