You're reading from Learning Linux Shell Scripting Unleash the power of shell scripts to solve real-world problems by breaking through the practice of writing tedious code

Product type Paperback

Published in Dec 2015

Publisher

ISBN-13 9781785286216

Length 306 pages

Edition 1st Edition

Tools

Ubuntu Server

Concepts

Shell Scripting

Author (1):

Ganesh Sanjiv Naik

View More author details

Table of Contents (14) Chapters

Preface

1. Getting Started and Working with Shell Scripting

2. Drilling Deep into Process Management, Job Control, and Automation FREE CHAPTER

3. Using Text Processing and Filters in Your Scripts

4. Working with Commands

5. Exploring Expressions and Variables

6. Neat Tricks with Shell Scripting

7. Performing Arithmetic Operations in Shell Scripts

8. Automating Decision Making in Scripts

9. Working with Functions

10. Using Advanced Functionality in Scripts

11. System Startup and Customizing a Linux System

12. Pattern Matching and Regular Expressions with sed and awk

Index

Chapter 5. Exploring Expressions and Variables

In the last chapter, you learned about how shell interprets any command, which is entered in the terminal or the command line. We also studied command substitution and separators in detail.

In this chapter, we will cover following topics:

Working with environment variables
Exporting variables
Working with read-only variables
Working with command line arguments (special variables, set and shift, and getopt)
Working with arrays

The rest of the chapter is locked

A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.

Unlock this book and the full library FREE for 7 days

Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of

Start free trial

Renews at $19.99/month. Cancel anytime

Authors (1)

Ganesh Sanjiv Naik

Ganesh Sanjiv Naik is an author, consultant, and corporate trainer for embedded Android, embedded Linux, and Internet of Things related product development. He completed his computer engineering in 1988. Since then, he has worked in this industry. He has worked on projects including micro-controller based projects to advanced Embedded Android projects. He has more than 20 years of professional experience and project accomplishment in information technology. Ganesh has a passion and deep desire for teaching. He has trained 1,000 engineers in Linux and Android product development. He has developed a lot of training material as well as curriculum for various universities and training institutes. He has an interest in spiritual study and practices such as meditation. He is a certified yoga teacher. His hobbies include yoga and martial arts. He has worked as a corporate trainer for Indian Space Research Organization, Intel, GE, Samsung, Motorola, Penang Skill Development Center (Malaysia), various companies in Singapore as well as various other corporates in India and other countries. He has started a company called Levana Technologies, which works with the Penang Skill Development Center (Malaysia) for consulting and training activities. If you would like to send feedback, suggestions, or corrections in the book, he can be contacted at https://in.linkedin.com/in/naikganesh. This book is his real-life experience…. He has worked as a consultant and corporate trainer in the following skills: • Internet of Things • Embedded Android, Android internals, and device driver development • USB and PCI device driver development in Linux • Embedded Linux and device driver development • Unix Shell scripting with sed and awk • Embedded C++ and C programming • Operating systems, software engineering, and networking • Problem solving—analysis, reasoning, and solution techniques for software engineers

See other products by Ganesh Sanjiv Naik