systemd

Enabling a service

    # systemctl enable ntpd.service

Disabling a service

    # systemctl disable ntpd.service

Starting a service

    # systemctl start nptd.service

Stopping a service

    # systemctl stop nptd.service

Reloading a service after modifying systemd configuration

    # systemctl daemon-reload
    # systemctl restart nptd.service

journalctl

    $ sudo journalctl --follow _SYSTEMD_UNIT=avahi-daemon.service
    $ sudo journalctl --follow --lines=10 --unit=avahi-daemon
    $ sudo journalctl -f -n 10 -u avahi-daemon

References

-- Frank Dean - 26 Feb 2016