C'è spesso molta confusione sui ruoli reciproci di OSX e FreeBSD. Ho trovato una valida citazione sul sistema di casa Apple con il quale mi trovo in perfetto accordo:

The config files don't *really* sit in /etc, home directories are 
in /Users and it's full of that kind of non-sensical nonsense. So, to say 
Mac OS X is like FreeBSD with knobs on, is like saying the Ferrari F1 car is 
like a Testarossa with knobs on - bits might have come from the same 
factory, but at different times and for different purposes.