chmod

CHMOD(1)						      General Commands Manual							  CHMOD(1)

NAME

       chmod - change access mode for files

SYNOPSIS

       chmod [-R] mode file ...

OPTIONS

       -R     Change hierarchies recursively

EXAMPLES

       chmod 755 file	   # Owner: rwx Group: r-x Others: r-x

       chmod +x file1 file2
			   # Make file1 and file2 executable

       chmod a-w file	   # Make file read only

       chmod u+s file	   # Turn on SETUID for file

       chmod -R o+w dir    # Allow writing for all files in dir

DESCRIPTION

       The  given mode is applied to each file in the file list. If the -R 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:

	 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

       Symbolic modes modify the current file mode in a specified way. The form is:

	 [who] op permissions { op permissions ...} {, [who] op ... }

       The  possibilities for who are u, g, o, and a, standing for user, group, other and all, respectively.  If who is omitted, a is assumed, but
       the current umask is used.  The op can be +, -, or =;  + turns on the given permissions, - turns them off; = sets  the  permissions  exclu-
       sively for the given who.  For example g=x sets the group permissions to --x.

       The  possible  permissions are r, w, x; which stand for read, write, and execute;  s turns on the set effective user/group id bits.  s only
       makes sense with u and g; o+s is harmless.

SEE ALSO

       ls(1), chmod(2).

																	  CHMOD(1)