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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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Creating users and groups and forcing users to change them on the next login

One of the most common things you are going to do on Linux machines is create a lot of users. There is a way to avoid this by using a centralized database for user authentication, but in reality, this is used only on machines in large deployments, so local users are still prevalent in most cases.

Having a way to deploy users and assign them passwords is something every admin needs whenever deploying a new server or desktop.

Getting ready

This recipe calls for two things.

The script has to be used with administrative privileges since it changes users on the system. Also, we need to prepare a file containing a user list in advance.

Before we show you our script, we must also mention that there is more than one way to read and parse a file when getting values for our scripts. It makes sense to try to understand different ways of doing this in order to up your scripting game. For this exact...

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