<b_jonas> learn ayacc is ais523\'s yacc parser generator implementation, get it from (darcs clone http://nethack4.org/projects/ayacc) or a snapshot from "http://nethack4.org/pastebin/ayacc-2020-04.tar.gz".

#!/bin/sh
for n; do if [ lethe = "$n" ]; then rm -f "$HACKENV/wisdom/$n"; else rm-p "$HACKENV/wisdom/$n"; fi && echo "Forget what?"; done