<elliott> addquote <olsner> combining macros and templates can get horrible... macro(foo<bar,baz>) is two macro arguments, for instance <olsner> variadic macros can work part-way around that though <olsner> the kind of workaround where you end up inside the wall instead of on the other side of the problem

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