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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

Perl arrays

Something that we can make use of in Perl is an array. These arrays are variables that are created from lists; put simply, they are basically multi-valued variables. If we were to use a container analogy to describe a variable, it will be either a cup or a placeholder for one value. An array will be analogous to a crate. We can describe the crate with a single name but we have to include additional naming elements to access each slot within the crate. A crate can hold more than a single item, just like an array.

We saw that by using bash scripting we can pass command line arguments in the script. The arguments were using their own variable name, $1, $2, and so on. This also clashed with the name of the program, to a degree, because of the fact that it was $0. Even though they may appear similar, there is no logical relationship between $0 and $1. The $0 variable is the name of the script and $1 is the first argument. When we look at this in Perl, we can start to see some of the...

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