file permission 000 Post: 302148772

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chmod

CHMOD(1)						      General Commands Manual							  CHMOD(1)

NAME

       chmod - change mode

SYNOPSIS

       chmod mode file ...

DESCRIPTION

       The  mode  of  each  named  file is changed according to mode, which may be absolute or symbolic.  An absolute mode is an octal number con-
       structed from the OR of the following modes:

       4000	 set user ID on execution
       2000	 set group ID on execution
       1000	 sticky bit, see chmod(2)
       0400	 read by owner
       0200	 write by owner
       0100	 execute (search in directory) by owner
       0070	 read, write, execute (search) by group
       0007	 read, write, execute (search) by others

       A symbolic mode has the form:

	      [who] op permission [op permission] ...

       The who part is a combination of the letters u (for user's permissions), g (group) and o (other).  The letter a stands for ugo.	If who	is
       omitted, the default is a but the setting of the file creation mask (see umask(2)) is taken into account.

       Op  can	be + to add permission to the file's mode, - to take away permission and = to assign permission absolutely (all other bits will be
       reset).

       Permission is any combination of the letters r (read), w (write), x (execute), s (set owner or group id) and t (save text - sticky).   Let-
       ters  u,  g or o indicate that permission is to be taken from the current mode.	Omitting permission is only useful with = to take away all
       permissions.

       The first example denies write permission to others, the second makes a file executable:

	      chmod o-w file
	      chmod +x file

       Multiple symbolic modes separated by commas may be given.  Operations are performed in the order specified.  The letter s  is  only  useful
       with u or g.

       Only the owner of a file (or the super-user) may change its mode.

SEE ALSO

       ls(1), chmod(2), chown (1), stat(2), umask(2)

																	  CHMOD(1)