Hello World Bash Shell Script - nixCraft

Hello World Bash Shell Script - Learn how to write your first bash shell script on a Linux, macOS, *BSD, LWS and Unix-like systems.

Linux shell scripting_v2

Unix Shell Script, PDF, Command Line Interface

Bash Script - Write Hello World Program - GeeksforGeeks

Linux shell scripting_v2

Bash Shell Convert Uppercase to Lowercase in Linux - nixCraft

nixCraft - Bash Shell Style (Programming) Guide From Google

Hello World! Bash Script - Javatpoint

The ultimate guide to Mac shell scripting

Writing an initial shell script - getting started with scripting