Linux Boot Process pt. 6 - Init 

Init is the mother of all processes.  See my <a href="https://www.thelinuxlink.net/~dann/init_hpr.txt">Notes</a> for a brief reference.  Also check out these resources:

<a href="https://en.wikipedia.org/wiki/Init">Wikipedia page on init</a>
init man page
inittab man page
<a href="https://upstart.ubuntu.com">Upstart</a>