ref: 681f270acd130d2c0d6aa78e1caf9dc3a1fcc3fb dir: /test/t.pp1/
/bwk/,/bwk/ { print $2, $1 } /ava/,/ava/ { print $2, $1 } /pjw/,/pjw/ { print $2, $1 }