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According to their website, there are exactly 30 versions in existence.

http://www.unix.com/unix-dummies-questions-answers/28637-versions-unix.html


There are many different versions of UNIX. Until a few years ago, there were two main versions: the line of UNIX releases that started at AT&T (the latest is System V Release 4), and another line from the University of California at Berkeley (the latest version is BSD 4.4). Some other major commercial versions include SunOS, Solaris, SCO UNIX, AIX, HP/UX, and ULTRIX. The freely available versions include Linux and FreeBSD.

Many versions of UNIX, including System V Release 4, merge earlier AT&T releases with BSD features. The recent POSIX standard for UNIX-like operating systems defines a single interface to UNIX. Advanced features differ among systems.

Most versions of UNIX can also work with window systems, which allow each user to have more than one "terminal" on a single display.

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