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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.
What else can I help you with?
Which TCP services are available with virtually all versions of Unix?
TCP was developed within a Unix system - the best known was BSD version 4, containing some of the first releases of TCP protocols. As a result, I would think that all Unix systems have the same TCP/IP services available to users.
What are some of the options available in UNIX command PS?
The 'ps' command may differ slightly in different versions of unix operating systems. It is usually better to use the 'man ps' command or the 'info ps' command to see the options that are available for your distribution.
How many different versions of Monopoly games are available?
There are over 1,000 different versions of Monopoly games available, featuring various themes and editions.
For which operating systems are spreadsheet packages available?
Spreadsheet packages are available for various operating systems, such as Windows, Macintosh, UNIX, Java, Linux, and VMS.
UNIX initially did not include a graphical interface?
Very true - the X-windows graphical interface was not available in Unix systems for a long time after Unix was available.
Did UNIX initially include a graphical interface?
Very true - the X-windows graphical interface was not available in Unix systems for a long time after Unix was available.
Versions of UNIX that come from Bell Labs are known as?
System V
Is UNIX used primarily with mainframes as a network operating system?
No. Licensed Unix implementations are a proprietary flexible general purpose operating system originally marketed for minicomputers and mid-range computers to support multiple users and tasks. When Personal Computers became available, versions of Unix were created for them. Unix was also implemented for the IBM mainframe. This is not the same as Linux which is an open source free system with many of the same capabilities and look & feel of unix but without the licensing requirement of unix.
Why can't Unix be run on microcomputers?
Many versions of Unix can be run on microcomputers. Xenix, Solaris, Mac OS X, and IRIX all run on microcomputers.
Does MySQL run on both Unix and Windows?
Yes. There are versions of MySQL for most Unix products, including Mac OS X, as well as Linux and Windows.
What are the different remote administration tools in Linux and UNIX?
The question is too vague to answer clearly. There are too many versions of Linux and Unix and third party vendors.
Could UNIX can run without the desktop?
If you are referring to the desktop as being a graphical user interface then Unix is capable of running without it. A GUI was a more recent addition to Unix, meaning that the earlier versions just used a command line and had no desktop environment at all. Today, you can install versions of Unix or Linux that do not have a graphical component at all, and several administrators (such as myself) prefer not to use a desktop.
