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Mastering Linux Shell Scripting

You're reading from   Mastering Linux Shell Scripting A practical guide to Linux command-line, Bash scripting, and Shell programming

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Product type Paperback
Published in Apr 2018
Publisher
ISBN-13 9781788990554
Length 284 pages
Edition 2nd Edition
Languages
Tools
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Authors (2):
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Mokhtar Ebrahim Mokhtar Ebrahim
Author Profile Icon Mokhtar Ebrahim
Mokhtar Ebrahim
Andrew Mallett Andrew Mallett
Author Profile Icon Andrew Mallett
Andrew Mallett
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Toc

Table of Contents (17) Chapters Close

Preface 1. The 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 the Stream Editor 9. Automating Apache Virtual Hosts 10. AWK Fundamentals 11. Regular Expressions 12. Summarizing Logs with AWK 13. A Better lastlog with AWK 14. Using Python as a Bash Scripting Alternative 15. Assessments 16. Other Books You May Enjoy

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 are 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...

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