       return [ n ]
              Causes  a  shell  function or . script to return to
              the invoking script with the return  status  speci-
              fied  by n.  If n is omitted then the return status
              is that of the last command executed.

              If return was executed from a  trap  in  a  TRAPxxx
              function, the effect is different for zero and non-
              zero return status.  With zero status (or after  an
              implicit  return at the end of the trap), the shell
              will return to whatever it was previously  process-
              ing;  with a non-zero status, the shell will behave
              as interrupted except that the return status of the
              trap  is  retained.   Note  that  the  signal which
              caused the trap is passed as the first argument, so
              the  statement `return $((128+$1))' will return the
              same status as if the signal had not been  trapped.
