Sysadmin

So the script won't run, or a web folder throws a 403 you can't explain. That's permissions, and the fix is usually chmod 644 for a plain file or chmod...

The service is down, you've got a shell, and the fix is one systemctl verb away. systemctl status nginx tells you whether it's running and tails the last few log...

A disk fills up, or a config file vanishes, and suddenly we need one file out of fifty thousand. find is the tool for that, and its shape never changes:...

Someone hands us a release.tar.gz and the clock's already ticking. Two commands cover almost everything: tar -xzf archive.tar.gz unpacks one, tar -czf archive.tar.gz folder builds one. The flags look cryptic...

Your server won't start and the terminal throws 'address already in use'. Something's squatting on that port, and sudo lsof -i :8080 (or ss -ltnp on a leaner box) tells...

Your dev server won't start, and Windows greets you with 'address already in use'. Something's squatting on the port, and the fix is to kill that process, not the port...