Start process at boot
 

I need to have mythbackend start as part of the boot process. Which file would I edit to add the necessary line to accomplish this feat?

Add a symlink to the file you want to run into one of the /etc/rcX.d dirs.
For example, if you wanted it loaded at runlevel 5 put a symlink into /etc/rc5.d
rc3.d or rc5.d are the best places for this sort of task.

sudo ln -s /path/to/mythtv-backend /etc/rc5.d