init replacements

the nice thing about linux and the let a thousand flowers bloom mode of operation is the explosion of different init replacements you have to choose from.

in the interests of not relearning this each time. i will write it down so i remember.

• fedora runlevel management - inittab has been replaced by systemd(1).
• ubuntu runlevel management - there’s no inittab and the /etc/init.d stuff is managed by upstart aka init(8)

update: looks like ubuntu’s moved to systemd(8) across the board for 16.x.