init system used by most modern Linux distros
Usage: systemctl <command>
mask Useful when stopping a service, as it prevents anything (such as IAAS systems) from restarting it.
cat <service-name> Prints the unit’s service files.
list-unit-files List all unit files; useful when grepped
list-units Shows only loaded units by default; less comprehensive than list-unit-files
daemon-reload Reload all unit files; this should be run when a unit file is modified