Cheatsheets

Meant to be viewed by the cheat alias at https://github.com/diepfote/scripts/blob/b840b338b0993ad853e88a70ea9ada75ae3f1925/source-me/posix-compliant-shells.sh#L122

LICENSE only applies to my own content (if it is an html page or a PDF it is almost a hundred percent nicked from somewhere else.)