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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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The case loop

Up until now, we have dealt with basic commands that allow us to do things we need when trying to write a script, such as looping, branching, breaking, and continuing program flow. A case loop, the topic of this recipe, is not strictly necessary, since the logic behind it can be created using a multi-nested group of individual if commands. The reason we are even mentioning this is simply because case is something that we are going to use a lot in our scripts, and the alternative of using if statements is both difficult to write and read, and complicated to debug.

Getting ready

One could simply say that a case loop or case statement is just another way of writing multiple if then else tests. Case is not something that can be used in place of a normal if statement, but there is a common situation in which a case statement makes our lives a lot less complicated and our scripts much easier to debug and understand. But before we go into that, we need to understand a...

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