What is systemd?

systemd is the init system used by many Linux distributions to manage the system and services. systemctl controls service state and startup behavior.

systemctl status ssh
sudo systemctl start ssh
sudo systemctl stop ssh
sudo systemctl enable ssh
sudo systemctl restart ssh
journalctl -u ssh -n 50

start starts a service now, while enable configures it to start during boot.

Practice

Check the SSH service status and inspect its logs with journalctl. Service names can differ by distribution.