ref: 96c2be96e4beaac08d89af4dea8069d9ca1c4b09
dir: /test/Compare.t/
#!/bin/rc
rfork e
oldawk=awk
awk=kwa
for(i in t.*){
echo -n $i:
$oldawk -f $i test.data >foo1
$awk -f $i test.data >foo2
if(cmp -s foo1 foo2)
echo
if not
echo BAD
diff -b foo1 foo2 | sed 's/^/ /;10q'
}