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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 dialog for menu-driven interactive scripts

Now that we've used expect, we know how to interact with other applications. The only thing left to do is learn how to make our scripts more interactive. It will come as no surprise that this problem is already solved in a standard way. In this recipe, we will use dialog, a command that may look deceptively simple but enables you to create both complex and visually interesting interactions with end users.

Getting ready

By definition, dialog, as with any interaction, makes your scripts unusable in a non-interactive environment. This can be solved by either not using dialog at all or detecting if the script is running as a service or as an interactive script.

Like expect, we must install dialog to use it. Simply use the following command:

sudo apt install dialog

Everything that you need is going to be installed as required.

How to do it…

dialog is a whole application that contains not only menus but...

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