Linux admins have always relied on the command line to manage their systems. While not as immediately intuitive as a GUI, command line interfaces (CLIs) open up the real power of computing with a slew of versatile commands that can be chained together for nearly any purpose. GUIs, on the other hand, are limited to the nearly always reduced functionality developers built into the buttons and screens. This model makes sense, since only some people will need the “advanced” capabilities of the command line, while others perform only a few tasks over and over with a minimum of knowledge about the software. Regular command line users develop a sense of how to best use the commands over time, but with this UpGuard primer, even dabblers can take advantage of some quick tricks using these five basic Linux commands.