63 lines
2.1 KiB
Groff
63 lines
2.1 KiB
Groff
.TH CHMOD 1
|
|
.SH NAME
|
|
chmod \- change access mode for files
|
|
.SH SYNOPSIS
|
|
\fBchmod [\fB\-R\fR] \fImode \fIfile\fR ...\fR
|
|
.br
|
|
.de FL
|
|
.TP
|
|
\\fB\\$1\\fR
|
|
\\$2
|
|
..
|
|
.de EX
|
|
.TP 20
|
|
\\fB\\$1\\fR
|
|
# \\$2
|
|
..
|
|
.SH OPTIONS
|
|
.FL "\-R" "Change hierarchies recursively"
|
|
.SH EXAMPLES
|
|
.EX "chmod 755 file" "Owner: rwx Group: r\-x Others: r\-x"
|
|
.EX "chmod +x file1 file2" "Make \fIfile1\fR and \fIfile2\fR executable"
|
|
.EX "chmod a\-w file" "Make \fIfile\fR read only"
|
|
.EX "chmod u+s file" "Turn on SETUID for \fIfile\fR"
|
|
.EX "chmod \-R o+w dir" "Allow writing for all files in dir"
|
|
.SH DESCRIPTION
|
|
.PP
|
|
The given mode is applied to each file in the file list. If the \fB\-R\fR
|
|
flag is present, the files in a directory will be changed as well.
|
|
The mode can be either absolute or symbolic. Absolute modes are given as an
|
|
octal number that represents the new file mode. The mode bits are defined as
|
|
follows:
|
|
.ta 0.25i
|
|
.nf
|
|
.PP
|
|
4000 Set effective user id on execution to file's owner id
|
|
2000 Set effective group id on execution to file's group id
|
|
0400 file is readable by the owner of the file
|
|
0200 writeable by owner
|
|
0100 executable by owner
|
|
0070 same as above, for other users in the same group
|
|
0007 same as above, for all other users
|
|
.PP
|
|
.fi
|
|
Symbolic modes modify the current file mode in a specified way. The form is:
|
|
.PP
|
|
[who] op permissions { op permissions ...} {, [who] op ... }
|
|
.PP
|
|
The possibilities for \fIwho\fR are \fIu\fR, \fIg\fR, \fIo\fR, and \fIa\fR,
|
|
standing for user, group, other and all, respectively.
|
|
If \fIwho\fR is omitted, \fIa\fR is assumed, but the current umask is used.
|
|
The op can be \fI+\fR, \fI-\fR, or \fI=\fR; \fI+\fR turns on the
|
|
given permissions, \fI\- \fRturns them off; \fI=\fR sets the permissions
|
|
exclusively for the given \fIwho\fR.
|
|
For example \fIg=x\fR sets the group permissions to \fI--x\fR.
|
|
.PP
|
|
The possible permissions are \fIr\fR, \fIw\fR, \fIx\fR; which stand for read,
|
|
write, and execute; \fIs\fR turns on the set effective user/group id bits.
|
|
\fIs\fR only makes sense with \fIu\fR and \fIg\fR;\fR o+s\fR is
|
|
harmless.
|
|
.SH "SEE ALSO"
|
|
.BR ls (1),
|
|
.BR chmod (2).
|