xref: /dragonfly/sbin/umount/umount.8 (revision 3170ffd7)
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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.\" $DragonFly: src/sbin/umount/umount.8,v 1.2 2003/06/17 04:27:34 dillon Exp $
31.\"
32.Dd May 8, 1995
33.Dt UMOUNT 8
34.Os
35.Sh NAME
36.Nm umount
37.Nd unmount filesystems
38.Sh SYNOPSIS
39.Nm
40.Op Fl fv
41.Ar special \&| node
42.Nm
43.Fl a | A
44.Op Fl F Ar fstab
45.Op Fl fv
46.Op Fl h Ar host
47.Op Fl t Ar type
48.Sh DESCRIPTION
49The
50.Nm
51command
52calls the
53.Xr unmount 2
54system call to remove a
55.Ar "special device"
56or the remote node (rhost:path) from the filesystem tree at the point
57.Ar node .
58If either
59.Ar special
60or
61.Ar node
62are not provided, the appropriate information is taken from the
63.Xr fstab 5
64file.
65.Pp
66The options are as follows:
67.Bl -tag -width indent
68.It Fl a
69All the filesystems described in
70.Xr fstab 5
71are unmounted.
72.It Fl A
73All the currently mounted filesystems except
74the root are unmounted.
75.It Fl F Ar fstab
76Specify the
77.Pa fstab
78file to use.
79.It Fl f
80The filesystem is forcibly unmounted.
81Active special devices continue to work,
82but all other files return errors if further accesses are attempted.
83The root filesystem cannot be forcibly unmounted.
84.It Fl h Ar host
85Only filesystems mounted from the specified host will be
86unmounted.
87This option implies the
88.Fl A
89option and, unless otherwise specified with the
90.Fl t
91option, will only unmount
92.Tn NFS
93filesystems.
94.It Fl t Ar type
95Is used to indicate the actions should only be taken on
96filesystems of the specified type.
97More than one type may be specified in a comma separated list.
98The list of filesystem types can be prefixed with
99.Dq no
100to specify the filesystem types for which action should
101.Em not
102be taken.
103For example, the
104.Nm
105command:
106.Bd -literal -offset indent
107umount -a -t nfs,mfs
108.Ed
109.Pp
110unmounts all filesystems of the type
111.Tn NFS
112and
113.Tn MFS
114that are listed in the
115.Xr fstab 5
116file.
117.It Fl v
118Verbose, additional information is printed out as each filesystem
119is unmounted.
120.El
121.Sh ENVIRONMENT
122.Bl -tag -width PATH_FSTAB
123.It Pa PATH_FSTAB
124If the environment variable
125.Pa PATH_FSTAB
126is set all operations are performed against the specified file.
127.El
128.Sh FILES
129.Bl -tag -width /etc/fstab -compact
130.It Pa /etc/fstab
131filesystem table
132.El
133.Sh SEE ALSO
134.Xr unmount 2 ,
135.Xr fstab 5 ,
136.Xr mount 8
137.Sh HISTORY
138A
139.Nm
140command appeared in
141.At v6 .
142