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28 .\" @(#)umount.8 8.2 (Berkeley) 5/8/95
36 .Nd unmount file systems
40 .Ar special | node | fsid
52 system call to remove a file system from the file system tree.
53 The file system can be specified by its
55 device or remote node (rhost:path), the path to the mount point
57 or by the file system ID
62 The options are as follows:
63 .Bl -tag -width indent
65 All the file systems described in
69 All the currently mounted file systems except
70 the root are unmounted.
76 The file system is forcibly unmounted.
77 Active special devices continue to work,
78 but all other files return errors if further accesses are attempted.
79 The root file system cannot be forcibly unmounted.
81 Only file systems mounted from the specified host will be
83 This option implies the
85 option and, unless otherwise specified with the
87 option, will only unmount
91 Is used to indicate the actions should only be taken on
92 file systems of the specified type.
93 More than one type may be specified in a comma separated list.
94 The list of file system types can be prefixed with
96 to specify the file system types for which action should
102 .Bd -literal -offset indent
103 umount -a -t nfs,nullfs
106 unmounts all file systems of the type
110 that are listed in the
114 Verbose, additional information is printed out as each file system
118 .Bl -tag -width ".Ev PATH_FSTAB"
120 If the environment variable
122 is set, all operations are performed against the specified file.
124 will not be honored if the process environment or memory address space is
129 for more information.)
132 .Bl -tag -width /etc/fstab -compact