- posix: all of our commands are standardised and easy to understand! me: how to make user? posix: useradd... no wait... adduser... no wait... useradd... me: there's two commands that do different things, and they're named basically the same? posix: uhh
- unix: do one thing and do it well! me: how to make file? unix: `touch`! me: i touch files to make them? uhh weird, why? unix: well originally it was to update modification times, and the ability to make a blank file came after me: so do two things and do them wel unix: uhh
