+.\"-
.\" Copyright (c) 1989, 1990, 1993, 1994
.\" The Regents of the University of California. All rights reserved.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\" must display the following acknowledgement:
-.\" This product includes software developed by the University of
-.\" California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
+.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" SUCH DAMAGE.
.\"
.\" @(#)chmod.1 8.4 (Berkeley) 3/31/94
-.\" $FreeBSD: src/bin/chmod/chmod.1,v 1.33 2002/10/01 20:32:59 trhodes Exp $
+.\" $FreeBSD$
.\"
-.Dd July 08, 2004
+.Dd January 7, 2017
.Dt CHMOD 1
.Os
.Sh NAME
.Ar
.Nm chmod
.Op Fl fv
-.Op Fl R Op Fl H | L | P
+.Op Fl R Op Fl H | L | P
.Op -a | +a | =a
.Ar ACE
.Ar
.Nm chmod
.Op Fl fhv
-.Op Fl R Op Fl H | L | P
+.Op Fl R Op Fl H | L | P
.Op Fl E
.Ar
.Nm chmod
.Op Fl fhv
-.Op Fl R Op Fl H | L | P
+.Op Fl R Op Fl H | L | P
.Op Fl C
.Ar
.Nm chmod
.Op Fl fhv
-.Op Fl R Op Fl H | L | P
+.Op Fl R Op Fl H | L | P
.Op Fl N
.Ar
.Sh DESCRIPTION
Lists (ACLs) associated with the listed files.
.Pp
The generic options are as follows:
-.Bl -tag -width Ds
+.Bl -tag -width indent
.It Fl f
Do not display a diagnostic message if
.Nm chmod
could not modify the mode for
-.Va file .
+.Va file ,
+nor modify the exit status to reflect such failures.
.It Fl H
If the
.Fl R
-option is specified, symbolic links on the command line are followed.
-(Symbolic links encountered in the tree traversal are not followed by
-default.)
+option is specified, symbolic links on the command line are followed
+and hence unaffected by the command.
+(Symbolic links encountered during tree traversal are not followed.)
.It Fl h
If the file is a symbolic link, change the mode of the link itself
rather than the file that the link points to.
option is specified, no symbolic links are followed.
This is the default.
.It Fl R
-Change the modes of the file hierarchies rooted in the files
+Change the modes of the file hierarchies rooted in the files,
instead of just the files themselves.
+Beware of unintentionally matching the
+.Dq Pa ".."
+hard link to the parent directory when using wildcards like
+.Dq Li ".*" .
.It Fl v
Cause
.Nm chmod
In addition, these options override each other and the
command's actions are determined by the last one specified.
.Pp
+If
+.Nm chmod
+receives a
+.Dv SIGINFO
+signal (see the
+.Cm status
+argument for
+.Xr stty 1 ) ,
+then the current filename as well as the old and new modes are displayed.
+.Pp
Only the owner of a file or the super-user is permitted to change
the mode of a file.
-.Sh DIAGNOSTICS
+.Sh EXIT STATUS
.Ex -std
.Sh MODES
Modes may be absolute or symbolic.
.Pp
.Bl -tag -width 6n -compact -offset indent
.It Li 4000
-(the set-user-ID-on-execution bit) Executable files with this bit set
+(the setuid 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
+Directories with this 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
and the
-.Ar suiddir
+.Cm suiddir
option to
.Xr mount 8 .
.It Li 2000
-(the set-group-ID-on-execution bit) Executable files with this bit set
+(the setgid bit).
+Executable files with this bit set
will run with effective gid set to the gid of the file owner.
.It Li 1000
-(the sticky bit)
+(the sticky bit).
See
.Xr chmod 2
and
-.Xr sticky 8 .
+.Xr sticky 7 .
.It Li 0400
Allow read by owner.
.It Li 0200
each permission bit specified in
.Ar perm ,
for which the corresponding bit in the file mode creation mask
+(see
+.Xr umask 2 )
is clear, is set.
Otherwise, the mode bits represented by the specified
.Ar who
each permission bit specified in
.Ar perm ,
for which the corresponding bit in the file mode creation mask
-is clear, is cleared.
+is set, is cleared.
Otherwise, the mode bits represented by the specified
.Ar who
and
.It =
The mode bits specified by the
.Ar who
-value are cleared, or, if no who value is specified, the owner, group
+value are cleared, or, if no
+.Ar who
+value is specified, the owner, group
and other mode bits are cleared.
Then, if no value is supplied for
.Ar who ,
``o'' by itself), in combination with the
.Ar perm
symbols ``s'' or ``t'', are ignored.
+.Pp
+The ``w'' permission on directories will permit file creation, relocation,
+and copy into that directory.
+Files created within the directory itself will inherit its group ID.
.Sh EXAMPLES OF VALID MODES
.Bl -tag -width "u=rwx,go=u-w" -compact
.It Li 644
Delete the item. Deletion may be granted by either this permission
on an object or the delete_child right on the containing directory.
.It readattr
-Read an objects basic attributes. This is implicitly granted if
+Read an object's basic attributes. This is implicitly granted if
the object can be looked up and not explicitly denied.
.It writeattr
Write an object's basic attributes.
1: admin allow write,chown
.Pp
This mode may not be used to add new entries.
-.It Fl E
+.It Fl E
Reads the ACL information from stdin, as a sequential list
of ACEs, separated by newlines. If the information parses correctly,
the existing information is replaced.
option is non-standard and its use in scripts is not recommended.
.Sh SEE ALSO
.Xr chflags 1 ,
-.Xr fsaclctl 1 ,
.Xr install 1 ,
.Xr chmod 2 ,
.Xr stat 2 ,
.Xr umask 2 ,
.Xr fts 3 ,
.Xr setmode 3 ,
+.Xr sticky 7 ,
.Xr symlink 7 ,
.Xr chown 8 ,
-.Xr mount 8 ,
-.Xr sticky 8
+.Xr mount 8
.Sh STANDARDS
The
.Nm chmod
projects / apple / file_cmds.git / blobdiff