ref: 246f891f014fe56d6778f3576b4fa6def8b19bf3 dir: /test/t.do/
NF > 0 { t = $0 gsub(/[ \t]+/, "", t) n = split($0, y) if (n > 0) { i = 1 s = "" do { s = s $i } while (i++ < NF) } if (s != t) print "bad at", NR }