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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 6. Iterating with Loops

Remember, scripts are for lazy people. We are the folk of the world who have better things to do than repeat a task 100 times or more; loops are our friends.

Looping structures are the life-blood of scripts. These loops are the workhorse engine that can iterate many times, repeating the same task reliably and consistently. Imagine having 100,000 lines of text within a CSV file that has to be checked for incorrect entries. A script can do this easily and accurately once developed but in the case of a human, the reliability factor and accuracy will fail very quickly.

So let's see how we can save our time and sanity by covering the following topics in this chapter:

  • For loops
  • Loop control
  • While and until
  • Read from file
  • Operator menu
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