ref: 8f2d3879a9c66d2633ca7ec1c3b0495981feb04f 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 }