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

What is Python?

Python is an object-oriented interpreted language that is designed to be easy to use and to aid Rapid Application Development. This is achieved by the use of simplified semantics in the language.

Python was born at the end of the 1980's, towards the very end of December 1989 by the Dutch developer, Guido van Rossum. A majority of the design of the language is aimed at clarity and simplicity and one of the main rules of the Zen of Python is:

"There should be one, and preferable only one, obvious way to do it."

Often systems will have both Python 2 and Python 3 installed; however, all newer distributions are switching to Python 3. We will be working with Python 3, it being the latest version installed on the Raspberry Pi.

Although, there is no shell, we can interact with Python using REPL: read, evaluate, print, and loop. We can access this by typing python3 in the command line. You should see something similar to the following screenshot:

We can see that we are presented with the...