Learning Linux Shell Scripting

Working in shell

Let's get started by opening the terminal, and we will familiarize ourselves with the Bash Shell environment:

1. Open the Linux terminal and type in:

   $ echo $SHELL
   /bin/bash
   

2. The preceding output in terminal says that the current shell is /bin/bash such as BASH shell:

   $ bash --version
   GNU bash, version 2.05.0(1)-release (i386-redhat-linux-gnu)
   Copyright 2000 Free Software Foundation, Inc.
   

Hereafter, we will use the word Shell to signify the BASH shell only. If we intend any other shell, then it will be specifically mentioned by name such as KORN and similar other shells.

In Linux, filenames in lowercase and uppercase are different; for example, the files Hello and hello are two distinct files. This is unlike Windows, where case does ...