Linux

Linux runs most servers, containers, and cloud workloads, and these guides cover the command-line skills and administration knowledge that keep those systems healthy — the shell, processes and services, networking, permissions, and troubleshooting. Expect practical one-liners and patterns that survive being used weekly, not trivia.

Topics include systemd, disk and process inspection, log analysis, and the modern tooling that's replaced older commands, aimed at engineers who operate real machines.