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Linux Command Line and Shell Scripting Techniques

Linux Command Line and Shell Scripting Techniques

By : Vedran Dakic, Jasmin Redzepagic
4.4 (5)
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Linux Command Line and Shell Scripting Techniques

Linux Command Line and Shell Scripting Techniques

4.4 (5)
By: Vedran Dakic, Jasmin Redzepagic

Overview of this book

Linux Command Line and Shell Scripting Techniques begins by taking you through the basics of the shell and command-line utilities. You’ll start by exploring shell commands for file, directory, service, package, and process management. Next, you’ll learn about networking - network, firewall and DNS client configuration, ssh, scp, rsync, and vsftpd, as well as some network troubleshooting tools. You’ll also focus on using the command line to find and manipulate text content, via commands such as cut, egrep, and sed. As you progress, you'll learn how to use shell scripting. You’ll understand the basics - input and output, along with various programming concepts such as loops, variables, arguments, functions, and arrays. Later, you’ll learn about shell script interaction and troubleshooting, before covering a wide range of examples of complete shell scripts, varying from network and firewall configuration, through to backup and concepts for creating live environments. This includes examples of performing scripted virtual machine installation and administration, LAMP (Linux, Apache, MySQL, PHP) stack provisioning and bulk user creation for testing environments. By the end of this Linux book, you’ll have gained the knowledge and confidence you need to use shell and command-line scripts.
Table of Contents (19 chapters)
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A shell script for VM administration

Some tasks are complicated to do from the command line, simply because we have a lot of commands that we have to repeat over and over again and then reuse the values that we got in one step in the step that follows it.

In this recipe, we are going to deal with such a task, doing basic maintenance on a VM. What we plan to do is create a script that will enable the user to do a couple of standard tasks on VMs running on the local server, simplifying administration tasks and removing the need to remember long commands. Our plan is to enable the user to start, stop, check status, and revert a VM running on the local server. The script is going to provide the user with the list of machines and give them the opportunity to choose any available machines or apply the command to all of them.

Let's see what is needed for this task.

Getting ready

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