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Improve description of absolute modes.

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Submitted by: Josh Gilliam <josh@quick.net>
PR: 6634
This commit is contained in:
Joseph Koshy 1998-05-19 06:24:50 +00:00
parent 80b41362fb
commit d5440753aa
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=36175
1 changed files with 46 additions and 20 deletions
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bin/chmod/chmod.1
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@ -33,7 +33,7 @@
.\" SUCH DAMAGE.
.\"
.\" @(#)chmod.1 8.4 (Berkeley) 3/31/94
.\" $Id: chmod.1,v 1.8 1997/11/13 00:28:47 julian Exp $
.\" $Id: chmod.1,v 1.9 1998/05/06 06:50:06 charnier Exp $
.\"
.Dd March 31, 1994
.Dt CHMOD 1
@ -103,35 +103,59 @@ The
utility exits 0 on success, and >0 if an error occurs.
.Sh MODES
Modes may be absolute or symbolic.
An absolute mode is an octal number constructed by
.Ar or-ing
the following values:
An absolute mode is an octal number constructed from the sum of
one or more of the following values:
.Pp
.Bl -tag -width 6n -compact -offset indent
.It Li 4000
set-user-ID-on-execution
( see
(the set-user-ID-on-execution bit) Executable files with this bit set
will run with effective uid set to the uid of the file owner.
Directories with the set-user-id bit set will force all files and
sub-directories created in them to be owned by the directory owner
and not by the uid of the creating process, if the underlying file
system supports this feature: see
.Xr chmod 2
for directories )
and the
.Ar suiddir
option to
.Xr mount 1 .
.It Li 2000
set-group-ID-on-execution
(the set-group-ID-on-execution bit) Executable files with this bit set
will run with effective gid set to the gid of the file owner.
.It Li 1000
sticky bit, see
.Xr chmod 2
(the sticky bit)
When set on a directory, unprivileged users can delete and rename
only those files in the directory that are owned by them, regardless of
the permissions on the directory. Under FreeBSD, the sticky bit is
ignored for executable files and may only be set for directories (see
.Xr sticky 8 ).
.It Li 0400
read by owner
Allow read by owner.
.It Li 0200
write by owner
Allow write by owner.
.It Li 0100
execute (or search for directories) by owner
.It Li 0070
read, write, execute/search by group
.It Li 0007
read, write, execute/search by others
For files, allow execution by owner. For directories, allow the owner to
search in the directory.
.It Li 0040
Allow read by group members.
.It Li 0020
Allow write by group members.
.It Li 0010
For files, allow execution by group members. For directories, allow
group members to search in the directory.
.It Li 0004
Allow read by others.
.It Li 0002
Allow write by others.
.It Li 0001
For files, allow execution by others. For directories allow others to
search in the directory.
.El
.Pp
The read, write, and execute/search values for group and others
are encoded as described for owner.
For example, the absolute mode that permits read, write and execute by
the owner, read and execute by group members, read and execute by
others, and no set-uid or set-gid behaviour is 755
(400+200+100+040+010+004+001).
.Pp
The symbolic mode is described by the following grammar:
.Bd -literal -offset indent
@ -280,13 +304,15 @@ option for the naughty bits.
.Sh SEE ALSO
.Xr chflags 1 ,
.Xr install 1 ,
.Xr mount 1 ,
.Xr chmod 2 ,
.Xr stat 2 ,
.Xr umask 2 ,
.Xr fts 3 ,
.Xr setmode 3 ,
.Xr symlink 7 ,
.Xr chown 8
.Xr chown 8 ,
.Xr sticky 8
.Sh STANDARDS
The
.Nm