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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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Chapter 8: Using the Command Line to Find, Extract, and Manipulate Text Content

Manipulating text is an everyday job for a full-time system administrator. It can happen for a variety of reasons – for example, you could just be trying to find a service option that you saw somewhere in some configuration file, without remembering what the name of the configuration file is. You know, those moments on Monday morning when you haven't had two cups of your favorite pick-me-up drink and your CPU hasn't booted properly yet? Or, maybe, when you're working with a text file that has a lot of content, but needs specific changes to be made, such as changing some configuration options from off to on, true to false, 0 to 1, and so on. This chapter is going to act as a prequel to one of the later chapters discussing shell scripting examples.

In this chapter, we are going to learn about the following:

  • Using text commands to merge file content
  • Converting DOS text...

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