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

       to the users specified.
