A selection of commands to manage services from Raspian/Debian Jessie onwards:
Print active services:
sudo systemctl list-units -t service
Print all services:
sudo systemctl list-units -t service --all
Print status of a single service:
sudo systemctl status cron
Start/Stop/Restart/Reload service:
sudo systemctl start ssh
sudo systemctl stop ssh
sudo systemctl restart ssh
sudo systemctl reload ssh
Enable/Disable service:
sudo systemctl enable ssh
sudo systemctl disable ssh
Help is available via man systemctl
Note: Pre Jessie (e.g. Wheezy) was using "service myservice start", "service myservice stop", "update-rc.d myservice defaults", etc.
Links:
https://blog.sleeplessbeastie.eu/2015/04/27/how-to-manage-system-services-on-debian-jessie/
https://wiki.archlinux.org/index.php/systemd
https://fedoraproject.org/wiki/SysVinit_to_Systemd_Cheatsheet
https://www.freedesktop.org/wiki/Software/systemd/Incompatibilities/
Credit to Milosz Galazka