ref: 1c424b1b4d5931f2a4b87b6f0f75827bc53ff9d7
dir: /testdir/p.42/
/Asia/ { pop["Asia"] += $3 }
/Africa/ { pop["Africa"] += $3 }
END { print "Asian population in millions is", pop["Asia"]
print "African population in millions is", pop["Africa"] }