Book Image

Mastering Linux Shell Scripting

By : Andrew Mallett
Book Image

Mastering Linux Shell Scripting

By: Andrew Mallett

Overview of this book

Shell scripting is a quick method to prototype a complex application or a problem by automating tasks when working on Linux-based systems. Using both simple one-line commands and command sequences complex problems can be solved with ease, from text processing to backing up sysadmin tools. In this book, you’ll discover everything you need to know to master shell scripting and make informed choices about the elements you employ. Get to grips with the fundamentals of creating and running a script in normal mode, and in debug mode. Learn about various conditional statements' code snippets, and realize the power of repetition and loops in your shell script. Implement functions and edit files using the Stream Editor, script in Perl, program in Python – as well as complete coverage of other scripting languages to ensure you can choose the best tool for your project.
Table of Contents (21 chapters)
Mastering Linux Shell Scripting
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Manipulating the awk record separator to report on XML data


So far, while we have been working with awk we have limited ourselves to working with individual rows, with each new row representing a new record. Although this is often what we want, where we work with tagged data, such as XML where an individual record may span multiple lines. In this case, we may need to look at setting the RS or record separator internal variable.

Apache Virtual Hosts

In Chapter 9, Automating Apache Virtual Hosts we worked with Apache Virtual Hosts. This uses tagged data that defines the start and end of each Virtual Host. Even though we prefer to store each Virtual Host in their own file, they can be combined into a single file. Consider the following file that stores the possible Virtual Host definitions, this can be stored as the virtualhost.conf file, as shown:

<VirtualHost *:80>
DocumentRoot /www/example
ServerName www.example.org
# Other directives here
</VirtualHost>

<VirtualHost *:80&gt...