Book Image

Mastering Linux Shell Scripting

By : Andrew Mallett
Book Image

Mastering Linux Shell Scripting

By: Andrew Mallett

Overview of this book

Shell scripting is a quick method to prototype a complex application or a problem by automating tasks when working on Linux-based systems. Using both simple one-line commands and command sequences complex problems can be solved with ease, from text processing to backing up sysadmin tools. In this book, you’ll discover everything you need to know to master shell scripting and make informed choices about the elements you employ. Get to grips with the fundamentals of creating and running a script in normal mode, and in debug mode. Learn about various conditional statements' code snippets, and realize the power of repetition and loops in your shell script. Implement functions and edit files using the Stream Editor, script in Perl, program in Python – as well as complete coverage of other scripting languages to ensure you can choose the best tool for your project.
Table of Contents (21 chapters)
Mastering Linux Shell Scripting
About the Author
About the Reviewer

Chapter 1. What and Why of Scripting with Bash

Welcome to the what and why of bash scripting. My name is Andrew Mallett and I am a bash scripting junkie or perhaps more accurately: a scripting junkie. As an administrator, I fail to see the need to do repetitive tasks manually. We get time for more interesting things when we choose scripts to carry out the laborious tasks that we don't like. In this chapter, we will introduce you to the what and why of bash scripting. If you are new, it will help you become familiar with scripts and also provide some great insights for those with more experience and who want to improve their skills. As we make our way through the chapter, each element is designed to be added to your knowledge to help you achieve your goals. While doing so, we will be covering the following topics:

  • Bash vulnerabilities

  • The bash command hierarchy

  • Preparing text editors for scripting

  • Creating and executing scripts

  • Debugging your scripts