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[dragonfly.git] / share / man / man8 / sticky.8
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1.\" Copyright (c) 1980, 1991, 1993
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32.\" @(#)sticky.8 8.1 (Berkeley) 6/5/93
33.\" $FreeBSD: src/share/man/man8/sticky.8,v 1.7.2.1 2001/08/17 13:08:50 ru Exp $
44cb301e 34.\" $DragonFly: src/share/man/man8/sticky.8,v 1.5 2006/05/26 19:39:40 swildner Exp $
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35.\"
36.Dd June 5, 1993
37.Dt STICKY 8
38.Os
39.Sh NAME
40.Nm sticky
41.Nd sticky text and append-only directories
42.Sh DESCRIPTION
43A special file mode, called the
44.Em sticky bit
45(mode S_ISVTX),
46is used to indicate special treatment
47for directories.
48It is ignored for regular files.
49See
50.Xr chmod 2
51or
52the file
44cb301e 53.In sys/stat.h
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54for an explanation of file modes.
55.Sh STICKY DIRECTORIES
56A directory whose `sticky bit' is set
57becomes an append-only directory, or, more accurately,
58a directory in which the deletion of files is restricted.
59A file in a sticky directory may only be removed or renamed
60by a user if the user has write permission for the directory and
61the user is the owner of the file, the owner of the directory,
62or the super-user.
63This feature is usefully applied to directories such as
64.Pa /tmp
65which must be publicly writable but
66should deny users the license to arbitrarily
67delete or rename each others' files.
68.Pp
69Any user may create a sticky directory.
70See
71.Xr chmod 1
72for details about modifying file modes.
ac561d34
SW
73.Sh HISTORY
74A
75.Nm
76command appeared in
77.At 32v .
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78.Sh BUGS
79Neither
80.Xr open 2
81nor
82.Xr mkdir 2
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83will create a file with the sticky bit set, it must
84be chmod'd after the fact.
85However,
86.Xr mkdir 1
87will do the right thing.