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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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Toc

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

Automating Virtual Host creation


After having created the template, we can now use this to create Virtual Host configurations. In the simplest terms, we need to replace the dummy-host.example.com URL with sales.example.com or marketing.example.com URL. Of course we have to also create the DocumentRoot directory, the directory where the web pages will be and also add some basic content. When we use a script to run through the process nothing will be forgotten and the edits will be accurate every time. The basics of the script will be as follows:

#!/bin/bash
WEBDIR=/www/docs
CONFDIR=/etc/httpd/conf.d
TEMPLATE=$HOME/template.txt
[ -d $CONFDIR ] || mkdir -p $CONFDIR
sed s/dummy-host.example.com/$1/ $TEMPLATE > $CONFDIR/$1.conf
mkdir -p $WEBDIR/$1
echo "New site for $1" > $WEBDIR/$1/index.html

If we ignore the shebang as the first line, we should know this by now. We can start our explanation in line 2 of the script:

Line

Meaning

WEBDIR=/www/docs/

We initialize the WEDIR variable that...

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