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Learning Linux Shell Scripting

You're reading from   Learning Linux Shell Scripting Leverage the power of shell scripts to solve real-world problems

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Product type Paperback
Published in May 2018
Publisher Packt
ISBN-13 9781788993197
Length 332 pages
Edition 2nd 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 (17) Chapters Close

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. Automating Repetitive Tasks 10. Working with Functions 11. Using Advanced Functionality in Scripts 12. System Startup and Customizing a Linux System 13. Pattern Matching and Regular Expressions with sed and awk 14. Taking Backup and Embedding Other Languages in Shell Scripts 15. Database Administration Using Shell Scripts 16. Other Books You May Enjoy

Automating Decision-Making in Scripts

In the last chapter, you learned about performing arithmetic operations in various ways, such as using declare, let, expr, and arithmetic expressions. You also learned about representing numbers in different bases, such as hex, octal, and binary, and using the bc utility for performing floating point or fractional arithmetic.

In real-world scripts, it is not just a sequential execution of commands, we need to check certain conditions or proceed according to certain logic, and then the script should continue executing. This is precisely what we do with automation. Automation refers to performing tasks, the sequence of which will change according to changes in the programming environment. A simple example would be to check whether a directory is present; if present, then change to that directory. Otherwise create a new directory and proceed...

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