I'm trying to understand the Linux init system.
I don't understand how there are three competing systems, yet the
service command seems to work on all of them.
From the service commands
service runs a System V init script or upstart job...
I'm using lubuntu 16.4 I think systemd is the default init system (
pstree shows systemd as root process). Systemd is not mentioned in the man page for service. Yet I still start and stop scripts using it.
Can anyone explain why this is?