Session 16 Bourne-Again Shell Programming Linux Kernel Programming Linux Programming

An Introduction to Bash Scripting
Scripting versus Interactive Shell Use
User Variables and Environmental Variables
Arithmetic in Bash
Tests, Conditionals, and Loops in Bash
Script Input and Output
Dissecting of Useful Scripts
Introduction
In this session, We’ll explore script programming in the Bourne-Again SHell, otherwise known as bash. Bash is the de facto standard command shell and shell scripting language on Linux and other UNIX systems. We’ll investigate some of the major language features of bash, including variables, arithmetic, control structures, input and output, and function creation.
Preliminaries
Let’s look at some preliminaries that are necessary to run bash scripts. You can tell which shell you’re currently using by interrogating the SHELL environment variable:
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