They aren't Apple Mac OS X utilities. They're versions of Linux, a Knox off of the underlying UNIX operating system of OS X, but really a completely different operating system. None of what you use on OS X will run on them.
You might also let him know that Unix is the root from which both Linux and OS X derive from, not just that they are incompatible. As far as knock-offs, people differ on which is the greater, the various versions of Linux (and BSD, some would argue) or OS X instead.
Different people prefer different things, of course.