<prooftechnique> learn prooftechnique n\xc3\xa9 NihilistDandy He was there some time ago. Maybe he\'ll come back. Maybe he\'s a nihilist, too. (Note from the Editor: He came back, and is a nihilist.)

[[ "$1" == ?*//* ]] || { echo usage: "mk[x]" file//contents >&2; exit 1; }; key="${1%%//*}"; value="${1#*//}"; echo "$value" > "$(echo-p "$key")" && echo "$key"