Control the systemd system and service manager. More information: https://www.freedesktop.org/software/systemd/man/systemctl.html.
systemctl --failed
systemctl start/stop/restart/reload {{unit}}
systemctl status {{unit}}
systemctl enable/disable {{unit}}
systemctl mask/unmask {{unit}}
systemctl daemon-reload
systemctl is-active {{unit}}
systemctl is-enabled {{unit}}