What actual program does the kernel run at boot in the default Jessie?

[Steve Litt <slitt@troubleshooters.com>]

Hi all,

In the past, I've been taught that the very last thing the kernel does
during boot is run whatever program is called /sbin/init. And
therefore, I can replace /sbin/init with the PID1 of my choice, always
assuming I can connect the myriad of dots.

In default new-installed Jessie, does the kernel still hand off to the
program called /sbin/init during boot, or does it do something else?

Thanks,

SteveT

Steve Litt                *  http://www.troubleshooters.com/
Troubleshooting Training  *  Human Performance