Bash Scripting Tutorial – Linux Shell Script and Command Line for Beginners

Overview of Bash shell and command line interface
The terms "shell" and "bash" are used interchangeably. But there is a subtle difference between the two.

The term "shell" refers to a program that provides a command-line interface for interacting with an operating system. Bash (Bourne-Again SHell) is one of the most commonly used Unix/Linux shells and is the default shell in many Linux distributions.