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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
Tools
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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

What is Perl?

Perl is a scripting language that was developed in the 1980's by Larry Wall to extend the functionality of sed and awk. It is an acronym for Practical Extraction and Reporting Language but has grown far bigger than its original purpose and today it is available on Unix, Linux, OS X, and Windows operating systems.

Although, it is a scripting language, it is not shell scripting; as such there is no Perl shell. This means that the code has to be executed via Perl scripts and not directly from the command line. The exception to this is the -e option to the perl command that can allow you to execute a perl statement. For example, we can use the following command line to print the ubiquitous Hello World:

$ perl -e ' print("Hello World\n");'

You will find that Perl is installed by default on most Linux and Unix systems as many programs will make use of Perl in their code. To check the version of Perl that you have installed on your system you can use the perl...

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