Book Image

Mastering Linux Shell Scripting - Second Edition

By : Mokhtar Ebrahim, Andrew Mallett
5 (1)
Book Image

Mastering Linux Shell Scripting - Second Edition

5 (1)
By: Mokhtar Ebrahim, Andrew Mallett

Overview of this book

In this book, you’ll discover everything you need to know to master shell scripting and make informed choices about the elements you employ. Grab your favorite editor and start writing your best Bash scripts step by step. 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. You will also learn to write complex shell scripts. This book will also deep dive into file system administration, directories, and system administration like networking, process management, user authentications, and package installation and regular expressions. Towards the end of the book, you will learn how to use Python as a BASH Scripting alternative. By the end of this book, you will know shell scripts at the snap of your fingers and will be able to automate and communicate with your system with keyboard expressions.
Table of Contents (17 chapters)

Apache name-based Virtual Hosts

For this demonstration, we will be working with the httpd.conf file from an Apache 2.4 HTTPD server taken from a CentOS 7.x host. To be perfectly honest, we are far more interested in the configuration file, as Red Hat or CentOS supply it, than the actual configuration changes that we will make. The file will be available for download from the code bundle of the chapter. Our purpose is to learn how we can extract data from the system-supplied file and create a template from it. We can apply this to Apache configuration files or any other text data file. It is the methodology we are looking at, not the actual result.

To have some understanding of what we are trying to do, we must first look at the /etc/httpd/conf/httpd.conf file, that is, CentOS, Red Hat Enterprise Linux, or Scientific Linux. The following screenshot shows the virtual host section...