Book Image

Mastering Linux Shell Scripting - Second Edition

By : Mokhtar Ebrahim, Andrew Mallett
5 (1)
Book Image

Mastering Linux Shell Scripting - Second Edition

5 (1)
By: Mokhtar Ebrahim, Andrew Mallett

Overview of this book

In this book, you’ll discover everything you need to know to master shell scripting and make informed choices about the elements you employ. Grab your favorite editor and start writing your best Bash scripts step by step. 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. You will also learn to write complex shell scripts. This book will also deep dive into file system administration, directories, and system administration like networking, process management, user authentications, and package installation and regular expressions. Towards the end of the book, you will learn how to use Python as a BASH Scripting alternative. By the end of this book, you will know shell scripts at the snap of your fingers and will be able to automate and communicate with your system with keyboard expressions.
Table of Contents (17 chapters)

AWK Fundamentals

The stream editor is not alone in its family and has a big brother, AWK. In this chapter, we will run through the basics of AWK and explore the power of the AWK programming language. We will learn why we need and love AWK and how we can make use of some of the basic features before we start putting AWK to practical use in the next two chapters. As we work our way through this, we will cover the following topics:

  • The history behind AWK
  • Displaying and filtering content from files
  • AWK variables
  • Conditional statements
  • Formatting output
  • Further filtering to display users by UID
  • AWK control files