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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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Variables via external commands

Sometimes, while writing a script, you will have to run a certain command and then use its output to do something in your script. A complicated way to do that is by using redirection. We say complicated because once you have to use redirection, you are unable to use it for other things. You could redirect to different file descriptors, but that is going to complicate things even more.

Getting ready

You will soon notice that it is hard to separate different things related to shell commands and functions. The reason for this is that there are a few fundamental rules that then get repeated in a different way. We are going to mention some of them a few times through this book, not because we like redundancy but because you need to completely understand those rules to be able to write good scripts.

This is why shell expansion exists, and there are two ways to put it into action to accomplish our task.

How to do it…

There are two...

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