Which systemd command lists boot-time details per service?

• A. systemctl status
• B. loginctl
• C. systemd-analyze blame
• D. journalctl -b

Answer: (C)

Boot performance analysis hinges on identifying how long each systemd unit takes to initialize during startup. The tool that provides a clear per-service boot-time detail by listing each unit’s initialization time, ordered from longest to shortest, is systemd-analyze blame. It helps you pinpoint which services are bottlenecks and worth tuning.

Other commands don’t fit this specific need: systemctl status shows a unit’s current state and recent activity, not boot-time durations; loginctl manages user sessions and seats; journalctl -b displays boot logs for the current boot, which is useful for debugging but doesn’t present a concise per-service timing breakdown.