To create this new user, log in to your desktop or server. If either has a GUI, you'll then need to open a terminal window from which you'll run the necessary command.

Linux is the most secure OS on the market for a reason. These are the security-centric commands you should have in your back pocket.

But if you’re a Mac or Linux user and you want to get the most out of your operating system (and your keystrokes), you owe it to yourself to get acquainted with the Unix command line.

Here's a quick guide to adding users and groups, and then how to add users to groups, all from the command line on the Linux platform.