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Unix Version 7 - man page for chmod (v7 section 1)

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CHMOD(1)										 CHMOD(1)

       chmod - change mode

       chmod mode file ...

       The  mode  of  each named file is changed according to mode, which may be absolute or sym-
       bolic.  An absolute mode is an octal number constructed	from  the  OR  of  the	following

       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  set-
       ting 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).  Letters 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.

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

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