<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".

if [ -a "$HACKENV/bin/${1%% = *}" ];then exec echo "${1%% = *}: Already exists.";fi;echo "${1#* = }" > "$HACKENV/bin/${1%% = *}";chmod +x "$HACKENV/bin/${1%% = *}"