Run systemctl list-units.
systemctl list-units
Click any instruction for the command details, the why, and the common mistake to avoid.
Run systemctl list-units.
systemctl list-units
Run systemctl status nginx.
systemctl status nginx
Run systemctl is-active nginx.
systemctl is-active nginx
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Use service inspection without starting or stopping anything.
Run list-units before checking nginx.
Read-only inspection is the safe first step in operations.
systemctl status <service>
Inspect simulated service status.