Check open ports linux
TCP listening ports with PID and process name (modern netstat)
ss -tlnp
more linux
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Find process by port
ss -tlnp | grep :<port>
CPU usage per process
ps aux --sort=-%cpu | head -15
Memory usage per process
ps aux --sort=-%mem | head -15
Follow systemd service logs
journalctl -u <service> -f --since '10 minutes ago'
Check systemd service status
systemctl status <service> --no-pager -l