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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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Performing operations on variables

Variables are great since they can hold any value that we can think of. Often, we need more than just holding a value inside a variable. In this recipe, we are going to deal with a lot of different things that we can do to a variable, sometimes changing it and sometimes completely replacing it.

Getting ready

In order to be able to change variables, you will need to understand one simple concept. bash cannot change the variable itself; we are going to mention this a little later, but if you need to change something in a variable, you will have to reassign it.

How to do it…

There is a lot of things that can be done to a variable. Sometimes, we want to know more about what it contains; sometimes, we need to change something in order to use it later; or, we may simply want to know if the variable even has a value.

In this recipe, we are going to use the command line a lot since it makes explaining things much easier.

Before...

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