ref: 6d0ade9e0f10517872304e94c2c5d0e3a14c426d dir: /test/t.pp1/
/bwk/,/bwk/ { print $2, $1 } /ava/,/ava/ { print $2, $1 } /pjw/,/pjw/ { print $2, $1 }