Linux System Administration
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.
Frequently asked questions
What is Linux used for?
Linux is an open-source operating system that powers the majority of web servers, cloud instances, containers, and embedded devices. Engineers use it to run and administer production workloads because it's stable, scriptable, and free.
How do I find what's using disk space on Linux?
Use `du -sh *` in a directory to see per-item sizes, `df -h` for filesystem usage, or a tool like `ncdu` for an interactive breakdown. Sort by size to quickly locate the largest consumers.
