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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

Summary


We are still making progress by leaps and bounds in script writing. I hope these ideas stay with you and you find the code examples useful. Functions are very important for the ease of maintenance of your scripts and their ultimate functionality. The easier the scripts are to maintain, the more likely you are to add improvements over time. We can define functions at the command line or within scripts but they need to be included in the script before they are used.

The functions themselves are loaded in to memory while the script is running, but as long as the script is forked and not sourced, they will be released from memory once the script is finished. We have touched a little upon sed in this chapter and we will look more at using the stream editor (sed) in the next chapter. The sed command is very powerful and we can make good use of it within scripts.

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