


      CHMOD(1)                    (UNIX 5.0)                   CHMOD(1)



      NAME
           chmod - change mode

      SYNTAX
           chmod mode files

      DESCRIPTION
           The permissions of the named files are changed according to
           mode, which may be absolute or symbolic.  An absolute mode
           is an octal number constructed from the OR of the following
           modes:

                4000      set user ID on execution
                2000      set group ID on execution
                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, the default if who is omitted.

           Op can be + to add permission to the file's mode, - to take
           away permission, or = 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); 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.

           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 and t only works with u.  Only
           the owner of a file (or the super-user) may change its mode.

      EXAMPLES
           The first example denies write permission to others, the
           second makes a file executable:
               chmod o-w file
               chmod +x file

      SEE ALSO
           ls(1), chmod(2).




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