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Mastering Linux Shell Scripting

You're reading from   Mastering Linux Shell Scripting Master the complexities of Bash shell scripting and unlock the power of shell for your enterprise

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Product type Paperback
Published in Dec 2015
Publisher
ISBN-13 9781784396978
Length 198 pages
Edition 1st Edition
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Author (1):
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Andrew Mallett Andrew Mallett
Author Profile Icon Andrew Mallett
Andrew Mallett
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Table of Contents (16) Chapters Close

Preface 1. What and Why of Scripting with Bash FREE CHAPTER 2. Creating Interactive Scripts 3. Conditions Attached 4. Creating Code Snippets 5. Alternative Syntax 6. Iterating with Loops 7. Creating Building Blocks with Functions 8. Introducing sed 9. Automating Apache Virtual Hosts 10. Awk Fundamentals 11. Summarizing Logs with Awk 12. A Better lastlog with Awk 13. Using Perl as a Bash Scripting Alternative 14. Using Python as a Bash Scripting Alternative Index

Chapter 7. Creating Building Blocks with Functions

In this chapter, we will dive into the wonderful world of functions. We can look at these as modular building blocks creating powerful and adaptive scripts. By creating functions, we add the code in a single building block isolated from the rest of the script. Focusing on improvements of a single function is a lot easier than trying to improve the script as a single object. Without functions, it is difficult to hone in on problem areas and the code is often repeated, it means that updates need to happen in many locations. Functions are named as blocks of code or scripts within scripts and they can overcome many problems associated with a more complex code.

As we make our way through the chapter, we will cover the following topics:

  • Functions
  • Passing parameters to functions
  • Returning values
  • Menu using functions
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