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* man/chmod.x: Document chmod's behavior with setuid and setgid bits.

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Remove misleading implication about leading zero.  Problem
reported by Jan Engelhardt in
<http://lists.gnu.org/archive/html/bug-coreutils/2007-05/msg00134.html>.
This commit is contained in:
Paul Eggert 2007-05-15 07:14:55 +02:00 committed by Jim Meyering
parent 893ac688cc
commit f4a5097ea3
2 changed files with 33 additions and 3 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2007-05-14 Paul Eggert <eggert@cs.ucla.edu>
* man/chmod.x: Document chmod's behavior with setuid and setgid bits.
Remove misleading implication about leading zero. Problem
reported by Jan Engelhardt in
<http://lists.gnu.org/archive/html/bug-coreutils/2007-05/msg00134.html>.
2007-05-13 Jim Meyering <jim@meyering.net>
Remove the generated tests/*/Makefile.am files from version control.

29
man/chmod.x
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@ -1,4 +1,4 @@
'\" Copyright (C) 1998, 1999, 2001, 2006 Free Software Foundation, Inc.
'\" Copyright (C) 1998, 1999, 2001, 2006, 2007 Free Software Foundation, Inc.
'\"
'\" This is free software. You may redistribute copies of it under the terms
'\" of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
@ -51,8 +51,7 @@ categories (\fBo\fP).
.PP
A numeric mode is from one to four octal digits (0\-7), derived by
adding up the bits with values 4, 2, and 1. Omitted digits are
assumed to be leading zeros, except that if the first digit is
omitted, a directory's set user and group ID bits are not affected.
assumed to be leading zeros.
The first digit selects the set user ID (4) and set group ID (2) and
restricted deletion or sticky (1) attributes. The second digit
selects permissions for the user who owns the file: read (4), write (2),
@ -72,6 +71,30 @@ In contrast,
.B chmod
ignores symbolic links encountered during recursive directory
traversals.
.SH "SETUID AND SETGID BITS"
.B chmod
clears the set-group-ID bit of a
regular file if the file's group ID does not match the user's
effective group ID or one of the user's supplementary group IDs,
unless the user has appropriate privileges. Additional restrictions
may cause the set-user-ID and set-group-ID bits of
.I MODE
or
.I RFILE
to be ignored. This behavior depends on the policy and
functionality of the underlying
.B chmod
system call. When in
doubt, check the underlying system behavior.
.PP
.B chmod
preserves a directory's set-user-ID and set-group-ID bits unless you
explicitly specify otherwise. You can set or clear the bits with
symbolic modes like
.B u+s
and
.BR g\-s ,
and you can set (but not clear) the bits with a numeric mode.
.SH "RESTRICTED DELETION FLAG OR STICKY BIT"
The restricted deletion flag or sticky bit is a single bit, whose
interpretation depends on the file type. For directories, it prevents