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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 expect to automate repetitive tasks based on text output

Bash is a formidable tool but sometimes, we need to do a particular thing that needs additional tools. In this recipe, we are going to be working with just such a tool called expect. Before we start, we must note that expect is not part of Bash scripting – it is a whole separate scripting language, written for a particular purpose, to enable interaction between your scripts and users and other systems. The idea behind it is to enable your scripts to not only execute normal commands that provide information when executed (command output) but to also be able to interact with any application that has a command-line interface (CLI) and get information from it.

Getting ready

In a simplified way, expect acts as a virtual keyboard that can type in some text and read what is on the screen. This is a powerful thing that is often needed because several applications and scripts are created by people who either had no...

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