The Linux Documentation Project: http://www.tldp.org – get the worldwide collection of HOWTOs.
“Shell Scripting Tutorial for Linux/Unix Beginners” at Guru99:
https://www.guru99.com/introduction-to-shell-scripting.html
Topic: Build Your Own Photo Server
Shell Commands:
Padraig Brady’s Command Line Tips
A Short Catalog of Bourne/Bash Shell Commands
Editor: