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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 text-based interactive scripts

The one thing that we haven't done so far is put any interaction in our scripts. The reason for this is simple – at this point, we've only discussed how to output information and not how to get it from the user or any other source. In the real world, interaction is something that we need to deal with because it is at the core of creating any script. We could say that there are two kinds of interaction. First, our script can interact with the system itself. This means using different variables and other information that we can get from the system – for example, free space in memory or on mounted disks. You could say that this is not real interaction but instead just reading real-time data from the system. But, still, it's a very useful way of making sure that a script does what it needs to do.

Another thing that we can do is interact with the user starting it. If the script is run by the system, it isn't something...

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