<oerjan> learn `rlexp <compressed code> is a command for expanding the rle format fungot ^show\'s for brainfuck code but doesn\'t accept as input.

#!/bin/sh
topic=$(echo "$1" | tr A-Z a-z)
[ -e "wisdom/$topic" ] || { echo "$1? ¯\(°_o)/¯"; exit 1; }
cat "wisdom/$topic"