Is Linux Unix?
"What's really needed to settle this is a definition of Unix. Unfortunately, there's no obvious definition against which we might compare Linux. The systems we all accept as unambiguously Unix -- that is, BSD, HP-UX, Solaris and Tru64 -- have more functional differences than, say, Linux and Unixware." Read the article at LinuxInsider. Apparently, you also need to have the sign of approval to be called a "Unix" by passing some tests.
