Many logging and user-related commands can help you check on your system and keep track of security matters. We guide you through several helpful tools.

Downloading files is central to modern computing. Whether you use your browser's function or rely on more specialized tools, you won't find a more versatile utility than Aria2.

The single-circuit-board Raspberry Pi computer, only as big as a credit card, makes it easy to gain experience with embedded Linux systems. We'll show you some hands-on examples of how to use the Raspberry Pi in an everyday environment.

The mysterious /proc virtual filesystem is a rich mine of information about everything in your system.

Security applications like antivirus protectors respond to events, rather than preventing them from happening, but the best security in Linux is architectural – that is, in its configuration.

Using the Common Unix Printing System, you can configure and manage your printer from the command line.

We show you how to build on the basic functionality of Vim by introducing some useful search commands.

The more frequently a command is used, the fewer letters it should have, so the use of twokey commands like ls, mv, and df is second nature. We look at a previously little-known representative of this club, di.