Linux Commands, When You Actually Need Them

There's a certain satisfaction in knowing exactly which command to reach for — no guessing, no tab-switching to a search engine, no half-remembered flags. This reference exists for that moment: when something breaks at 11pm and you need the right tool fast.

Every entry here is built around real sysadmin scenarios. Not abstract syntax diagrams, but the kind of usage you'd actually type into a terminal — with context that explains why it works, not just what it does.

What You'll Find Here

File and directory operations for day-to-day navigation and management
Process monitoring and control with ps, top, kill, and friends
Network diagnostics using ss, netstat, curl, and dig
Log inspection and filtering with journalctl, grep, and awk
Disk and filesystem checks via df, du, and lsblk
User and permission management for secure, predictable systems

Whether you're tracing a service failure, cleaning up disk space, or hardening a fresh server, these references are written to get you moving — clearly and without noise.

Looking for something specific? Browse by category or head to the contact page to suggest a command worth covering.