Bash tips I

Inputs to functions:

https://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-8.html

Outputs from functions:

https://www.linuxjournal.com/content/return-values-bash-functions

Check for empty variable:

https://www.cyberciti.biz/faq/unix-linux-bash-script-check-if-variable-is-empty/

Keyboard shortcuts:

http://teohm.com/blog/shortcuts-to-move-faster-in-bash-command-line/