umask [ -S ] [ mask ]
       The  umask  is  set to mask.  mask can be either an
       a symbolic value as described in chmod(1).  If mask
       the  current value is printed.  The -S option caus-
       be printed as a  symbolic  value.   Otherwise,  the
       as   an  octal  number.   Note that in the symbolic
       sions you specify are those which are to be allowed
(not denied)

       to the users specified.
