]> git.saurik.com Git - apple/xnu.git/blob - bsd/man/man7/sticky.7
xnu-6153.141.1.tar.gz
[apple/xnu.git] / bsd / man / man7 / sticky.7
1 .\" Copyright (c) 1980, 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 .\" @(#)sticky.8 8.1 (Berkeley) 6/5/93
29 .\" $FreeBSD$
30 .\"
31 .Dd June 5, 1993
32 .Dt STICKY 7
33 .Os
34 .Sh NAME
35 .Nm sticky
36 .Nd sticky text and append-only directories
37 .Sh DESCRIPTION
38 A special file mode, called the
39 .Em sticky bit
40 (mode S_ISVTX),
41 is used to indicate special treatment
42 for directories.
43 It is ignored for regular files.
44 See
45 .Xr chmod 2
46 or
47 the file
48 .In sys/stat.h
49 for an explanation of file modes.
50 .Sh STICKY DIRECTORIES
51 A directory whose `sticky bit' is set
52 becomes an append-only directory, or, more accurately,
53 a directory in which the deletion of files is restricted.
54 A file in a sticky directory may only be removed or renamed
55 by a user if the user has write permission for the directory and
56 the user is the owner of the file, the owner of the directory,
57 or the super-user.
58 This feature is usefully applied to directories such as
59 .Pa /tmp
60 which must be publicly writable but
61 should deny users the license to arbitrarily
62 delete or rename each others' files.
63 .Pp
64 Any user may create a sticky directory.
65 See
66 .Xr chmod 1
67 for details about modifying file modes.
68 .Sh HISTORY
69 A
70 .Nm
71 command appeared in
72 .At 32v .
73 .Sh BUGS
74 Neither
75 .Xr open 2
76 nor
77 .Xr mkdir 2
78 will create a file with the sticky bit set.