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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

Using code snippets

All we mean by the term code snippets is a prepared code that we can read into our current script. This is especially easy with vim being able to read the contents of other text files during editing:

ESC
:r <path-and-filename>

For example, if we need to read the contents of a file called if located in $HOME/snippets, we will use the following key sequences in vim:

ESC
:r $HOME/snippets/if

The contents of this file is read into the current document below the current cursor position. In this way, we can make the code snippets as complex as we need and maintain the correct indentations to aide readability and consistency.

So, we will make it our duty to always create a snippets directory in our home directory:

$ mkdir -m 700 $HOME/snippets

It is not required to share the directory, so it is good practice to set the mode to 700 or private to the user when it is being created.

When creating snippets, it is your choice to use a pseudo-code or real examples. My preference is...

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