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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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Quoting in the shell

Quotes are something that we take for granted, not only in Linux but also in a lot of other applications. In this recipe, we are going to deal with how quotes work, which quotes to use, and how to make sure that your quoted part of the script behaves as you intended.

Getting ready

Using quotes is incredibly important in Linux, not only in shell scripts but also in any other application that uses text. In this context, quotes behave pretty much the same way as brackets do in mathematical expressions—they offer us the way to change how an expression is evaluated. Almost all command-line tools use a space as a delimiter that tells the tool where one string ends and another one begins. You probably ran into this when you tried to use a file or a directory that has a space in its name. Usually, we solve this problem by using an escape character (\), but it makes it much easier to read if we apply quotes.

This is not the only reason we use quotes,...

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