About

Admin's Choice is a practical Linux and Unix reference for system administrators, SREs, and developers. The site has been online since 2001, and its goal has stayed the same: clear, tested, no-nonsense references you can actually use at the terminal.

What you'll find here

Hands-on guides and references across scheduling (cron and systemd timers), shell scripting, system administration, services and systemd, monitoring and performance, networking, DevOps tooling, Python, and security. Every reference aims to show real commands, real output, and the gotchas that trip people up — not filler.

How content is made

Commands and examples are tested on current distributions — typically Ubuntu, Debian, and RHEL-family systems — and each article notes the environments it was checked on. When software changes, we revise. Corrections from readers are welcome and genuinely valued; a reference is only as good as its accuracy.

Who it's for

Whether you're looking up cron syntax for the hundredth time, debugging a systemd service that won't start, or learning what vmstat is actually telling you, the aim is to get you the answer quickly and correctly.

Get in touch

Found an error, have a question, or want to suggest a topic? Use the contact page. You can also browse everything by topic or see the full list of posts.