How do I find out what version of unix my Mac is running?

Somebody wants to know what version of unix (BSD? Free BSD? whatever? and version number and release date) runs on Mac computers in Terminal under OS 10.6.x. Does anyone know what it is off the top of their heads? Is there a Terminal command that I can type to ascertain this information?
Thanx

To the best of my knowledge, Mac OS X did not take anything from OSF/1 except maybe ideas.
What they did do, was take the Mach micro-kernel from Carnegie Mellon and the FreeBSD sources to create something that has similar components to OSF/1.  Apple even used newer Mach version than any of the official OSF/1 vendors (such as Digital Equipment Corporation's OSF/1 (aka Digital UNIX, aka Tru64 UNIX which I did kernel development work on while a DEC/Compaq/HP employee)).
Then again, I wasn't there when NeXT was started, so I could be wrong.  I just do not remember NeXT being part of the OSF/1 consortium.

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