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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 variables in shell scripting

Variables sometimes look simple enough—they are there to enable you to put a changing value in your code. The problem is that in this simplicity, there are a couple of things you should know about where you actually place a variable—in something called a context. We are going to deal with that in this chapter.

Getting ready

When we're talking about scripting, things are a little different than they are when we are working in an interactive environment. Every environment variable that is available to you when you use the interactive shell is also available to you in the script. There is, however, one important thing you must always remember. As we said earlier, your script is running in a certain context. This context is defined by the user that has run the script. In a previous chapter, we wanted you to make sure that you have appropriate permissions to do tasks that you need in the script.

In this recipe, we are going...

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