usage: pawk 'code' [files...]
usage: pawk [-F FSP] 'BEGIN{code} /pattern/{code} END{code}' [files...]
option: -F FSP  field separator pattern, default: \s+ (whitespace)
field variables: $_1, $_2, $_3 ... $__3, $__2, $__1
example: ls -la /tmp | pawk '/2010/{$s+=$_5}END{print $s}'