CHMOD(1)                GENIX Programmer's 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  permis-
           sions),  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  crea-
           tion 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.   Opera-
           tions  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.





      Printed 11/16/83                                                        1

      CHMOD(1)                GENIX Programmer's Manual                CHMOD(1)



      SEE ALSO
           ls(1), chmod(2), stat(2), umask(2), chown(8)





















































      Printed 11/16/83                                                        2