Book Image

Linux Command Line and Shell Scripting Techniques

By : Vedran Dakic, Jasmin Redzepagic
Book Image

Linux Command Line and Shell Scripting Techniques

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)

Using nmcli and netplan

Network configuration has changed significantly in the past couple of releases – for all Linux distributions. It doesn't really matter whether we are discussing Red Hat and its clones or Debian and its clones – these changes happened across all of them. For example, Red Hat and its clones went from a network service to a mixture of network and NetworkManager services to a fully NetworkManager-based configuration. Ubuntu was using a networking service until recently when it switched to netplan. Let's explain all of these concepts so that we can have a full overview of these configuration methods and cover any situations you might end up in. We will also cover a scenario in which someone might want to turn off netplan and go back to using the networking service on Ubuntu.

Getting ready

We just need one Ubuntu and one CentOS machine for this recipe. Let's say we are going to use server1 and client1 to master nmcli and netplan...