"How to be Unix-y in Eleventy Billion Steps"

http://www.robertames.com/blog.cgi/entries/the-unix-way-comm...

TLDR: standard list of long options <https://www.gnu.org/prep/standards/standards.html#Option-Tab...> and short options from -a to -z <http://www.catb.org/~esr/writings/taoup/html/ch10s05.html>.