umask [ -S ] [ mask ]
       The  umask  is  set to mask.  mask can be either an
       octal number or a symbolic value  as  described  in
       chmod(1).  If mask is omitted, the current value is
       printed.  The -S  option  causes  the  mask  to  be

       printed  as  a symbolic value.  Otherwise, the mask
       is printed as an octal number.  Note  that  in  the
       symbolic form the permissions you specify are those
       which are to be allowed (not denied) to  the  users
       specified.
