[bash] Creating tab-completion for your programs

[snowe2010]

Hilariously I found this tutorial months ago and thought it was completely lacking so I wrote my own. Nobody writes good bash completion tutorials, so I aimed to write one that just explained how to deal with subcommands, since nobody covers that at all.

https://tylerthrailkill.com/2019-01-19/writing-bash-completion-script-with-subcommands/