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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 services and targets

Managing services tends to be something that we need to do at times. For example, when we install a new piece of software that comes bundled as a service, we need to be able to manage it so that it can work properly. This is what we're going to work on as we go through this recipe. We're also going to give a short description of how systemctl configuration files work, but without going on a 100 mile-long journey, as it's the recipe that's the focus. However, we will make sure that we provide you with additional links where you can learn a whole lot more about systemd as it's a big topic and an important one.

Getting ready

We're going to use our cli2 CentOS for this recipe, just so that it doesn't feel left out.

How to do it…

The basic idea behind managing services in practical terms is to have services start either at the point in time when we want them to be started, or to have them available after...

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