<b_jonas> slashlearn euclid//Euclid is a short geeky game in which the goal is to do Euclidean compass and straightedge constructions in as few steps as possible. It runs in the browser, found at "http://www.euclidthegame.com/". It was popular among #esoteric regulars in 2016-07.

#! /bin/bash
cmd="$1"
shift
f="$*"
if [[ -z "$f" && "$cmd" == *\ * ]]; then f="${cmd#* }"; cmd="${cmd%% *}"; fi
if [[ -z "$f" ]]; then echo try: \`f command filename; elif [[ -e "$f" ]]; then "$cmd" "$(< "$f")"; else echo no such file: "$f"; fi