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Learning Linux Shell Scripting

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

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Product type Paperback
Published in Dec 2015
Publisher
ISBN-13 9781785286216
Length 306 pages
Edition 1st Edition
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Author (1):
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Ganesh Sanjiv Naik Ganesh Sanjiv Naik
Author Profile Icon Ganesh Sanjiv Naik
Ganesh Sanjiv Naik
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Table of Contents (20) Chapters Close

Learning Linux Shell Scripting
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started and Working with Shell Scripting FREE CHAPTER 2. Drilling Deep into Process Management, Job Control, and Automation 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

Understanding functions


We, human beings, in our day-to day lives, take help from people, who are specialized in certain knowledge or skills, such as doctors, lawyers, and barbers. This helps our lives to be more organized and comfortable so that we need not learn every skill in this world. We take advantage of skills that have already been acquired by other people. The same thing applies to software development as well. If we use whatever code or scripts that have already been developed, then this will save our time and energy.

In real-world scripts, we break down big tasks or scripts into smaller logical tasks. This modularization of scripts helps in the better development and understanding of code. The smaller logical blocks of script are be called functions.

The advantages of functions are as follows:

  • If the script is very big, then understanding it becomes very difficult. Using functions, we can easily understand complex script through logical blocks or functions.

  • When a big and complex...

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