I understand that this is a UNIX trait, I tried to choose my words carefully. Linux follows that philosophy (to some extent). Not: that is a Linux philosophy

I understand that this is a UNIX trait, I tried to choose my words carefully. Linux follows that philosophy (to some extent). Not: that is a Linux philosophy. My main curiosity comes from how Mac OS X, being a sort of flavor of BSD, also follows that philosophy. The Mach kernel probably messes all that up though. Anyone familiar with the such things?