What is the diff betn unix and bsd unix?
Unix in really an umbrella term for a whole category of
operating systems that may share some similar code-base. Originally
developed in the late 70's by Bell labs, Unix has been forked and
re-factored many times by many companies. BSD is a fork of the
original Unix system that is currently maintained by Berkley State
University, CA. Other Unix forks come from SCO, Oracle, and a few
others.
On another note, Linux is a free software alternative to Unix,
but shares none of the original code.