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 March 10, 2024 32.Dt UMOUNT 8 33.Os 34.Sh NAME 35.Nm umount 36.Nd unmount filesystems 37.Sh SYNOPSIS 38.Nm 39.Op Fl dfv 40.Ar special \&| node 41.Nm 42.Fl a | A 43.Op Fl F Ar fstab 44.Op Fl dfv 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 d 75If the filesystem was mounted from a 76.Xr vn 4 77vnode disk, detach the underlying disk as well. 78.It Fl F Ar fstab 79Specify the 80.Pa fstab 81file to use. 82.It Fl f 83The filesystem is forcibly unmounted. 84Active special devices continue to work, 85but all other files return errors if further accesses are attempted. 86The root filesystem cannot be forcibly unmounted. 87.It Fl h Ar host 88Only filesystems mounted from the specified host will be 89unmounted. 90This option implies the 91.Fl A 92option and, unless otherwise specified with the 93.Fl t 94option, will only unmount 95.Tn NFS 96filesystems. 97.It Fl t Ar type 98Is used to indicate the actions should only be taken on 99filesystems of the specified type. 100More than one type may be specified in a comma separated list. 101The list of filesystem types can be prefixed with 102.Dq no 103to specify the filesystem types for which action should 104.Em not 105be taken. 106For example, the 107.Nm 108command: 109.Bd -literal -offset indent 110umount -a -t nfs,mfs 111.Ed 112.Pp 113unmounts all filesystems of the type 114.Tn NFS 115and 116.Tn MFS 117that are listed in the 118.Xr fstab 5 119file. 120.It Fl v 121Verbose, additional information is printed out as each filesystem 122is unmounted. 123.El 124.Sh ENVIRONMENT 125.Bl -tag -width PATH_FSTAB 126.It Pa PATH_FSTAB 127If the environment variable 128.Pa PATH_FSTAB 129is set all operations are performed against the specified file. 130.El 131.Sh FILES 132.Bl -tag -width /etc/fstab -compact 133.It Pa /etc/fstab 134filesystem table 135.El 136.Sh SEE ALSO 137.Xr unmount 2 , 138.Xr fstab 5 , 139.Xr mount 8 , 140.Xr vnconfig 8 141.Sh HISTORY 142A 143.Nm 144command appeared in 145.At v1 . 146