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 13. Using Perl as a Bash Scripting Alternative

Scripting with bash can help you with the automation of tasks and you can achieve a great deal by mastering bash scripting. However, your journey should not end with bash. While we have seen the power available in your bash scripts, we are limited by the commands we can run and the options they have. Bash scripts allow us to access commands; whereas, if we use Perl scripts, we have access to the programming interfaces or the APIs of the system. In this way, we can often achieve more with fewer resources.

In this chapter, we will introduce Perl scripting and some other basic scripts that we can use to learn Perl; we will cover the following topics:

  • What is Perl?

  • Hello World

  • Arrays in Perl

  • Conditional tests in Perl

  • Functions