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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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Configuring network settings interactively

Often, we don't have access to GUIs and GUI-based configuration tools. If we need to configure network settings, this can lead to a bunch of problems. Either we need to learn the syntax of /etc/sysconfig/network-script files (not user-friendly), or we need to use the tools that are at our disposal to configure network settings from the CLI. Let's learn how to use nmcli for that purpose.

Getting ready

Before you start this recipe, you need to make sure that you are using our cli2 CentOS machine as Ubuntu doesn't use nmcli by default. Once you've done that, you're all set!

How to do it…

Configuring network settings via nmcli isn't difficult, but at the same time, it's far from super user-friendly. There's quite a bit of syntax involved and sometimes, that can get a bit overwhelming. So, let's create a script that's going to do three things for us:

  • Configure network...

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