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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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Using screen

screen is one of those text utilities that was incredibly popular in the 1990s and 2000s, with its popularity shrinking after that. System administrators often have to open multiple consoles on the same machine or use any of those multiple consoles to connect to external machines. Let's see how screen fits into this scenario.

Getting ready

Before starting with this recipe, we need to make sure that we have screen on our Linux machine. So, we need to use the following command:

apt-get -y install screen

After that, we're ready to follow our recipe.

How to do it…

We need to start a regular text Terminal (this can be done in the GUI as well, but it can be considered as a bit of a less-effective way to use screen real estate). Then, we just need to type in the following command:

screen

When we start screen, it is going to throw us a long piece of text about licensing and other less-than-interesting subjects, with a couple of important...

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