xref: /freebsd/sbin/umount/umount.8 (revision 7f3dea244c40159a41ab22da77a434d7c5b5e85a)
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32.\"     @(#)umount.8	8.2 (Berkeley) 5/8/95
33.\" $FreeBSD$
34.\"
35.Dd May 8, 1995
36.Dt UMOUNT 8
37.Os BSD 4
38.Sh NAME
39.Nm umount
40.Nd unmount filesystems
41.Sh SYNOPSIS
42.Nm umount
43.Op Fl fv
44.Ar special \&| node
45.Nm umount
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
53command
54calls the
55.Xr unmount 2
56system call to remove a
57.Ar "special device"
58or the remote node (rhost:path) from the filesystem tree at the point
59.Ar node .
60If either
61.Ar special
62or
63.Ar node
64are not provided, the appropriate information is taken from the
65.Xr fstab 5
66file.
67.Pp
68The options are as follows:
69.Bl -tag -width indent
70.It Fl a
71All the filesystems described in
72.Xr fstab 5
73are unmounted.
74.It Fl A
75All the currently mounted filesystems except
76the root are unmounted.
77.It Fl f
78The filesystem is forcibly unmounted.
79Active special devices continue to work,
80but all other files return errors if further accesses are attempted.
81The root filesystem cannot be forcibly unmounted.
82.It Fl h Ar host
83Only filesystems mounted from the specified host will be
84unmounted.
85This option implies the
86.Fl A
87option and, unless otherwise specified with the
88.Fl t
89option, will only unmount
90.Tn NFS
91filesystems.
92.It Fl t Ar type
93Is used to indicate the actions should only be taken on
94filesystems of the specified type.
95More than one type may be specified in a comma separated list.
96The list of filesystem types can be prefixed with
97.Dq no
98to specify the filesystem types for which action should
99.Em not
100be taken.
101For example, the
102.Nm
103command:
104.Bd -literal -offset indent
105umount -a -t nfs,mfs
106.Ed
107.Pp
108umounts all filesystems of the type
109.Tn NFS
110and
111.Tn MFS .
112.It Fl v
113Verbose, additional information is printed out as each filesystem
114is unmounted.
115.El
116.Sh FILES
117.Bl -tag -width /etc/fstab -compact
118.It Pa /etc/fstab
119filesystem table
120.El
121.Sh SEE ALSO
122.Xr unmount 2 ,
123.Xr fstab 5 ,
124.Xr mount 8
125.Sh BUGS
126When using union filesystems,
127.Xr umount 8
128cannot always determine the node which is the mountpoint.
129In this case,
130it is necessary to specify the relevant directory to be unmounted
131in the same form as that displayed by
132.Xr mount 8 .
133For example, given a mount entry like this:
134.Bd -literal -offset indent
135<above>/tmpdir on /cdrom (local, user mount)
136.Ed
137.Pp
138then the command:
139.Bd -literal -offset indent
140umount '<above>/tmpdir'
141.Ed
142.Pp
143would unmount
144.Ar /tmpdir
145from the mountpoint
146.Ar /cdrom .
147.Sh HISTORY
148A
149.Nm
150command appeared in
151.At v6 .
152