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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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Managing background jobs

There are various types of situations where we would like to start a process and run it in the background. For example, let's say that we want to start a process, log off, and then come back tomorrow and check the result of that process. Let's learn how this works by using an example.

Getting ready

Keep the cli1 virtual machine powered on and let's use the shell to explain how the idea of a background process works, as opposed to a foreground process. We will make sure that we also explain the concept in the How it works… section.

How to do it…

Let's imagine a scenario in which we want to download a large file by using shell tools. The usual suspect that we'd use for this kind of task in Linux is a program called wget. We want to start a wget session (wget is a shell command that enables us to download files from the http and ftp URIs) to download a large ISO file, but we want to log off (or do something else...

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