LinuxQuestions.org - Diffrence between Linux and Unix OS?

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Diffrence between Linux and Unix OS?

Hi all,

what are all the differnce between Linux and Unix OS?

Is Unix support the Graphical User Interface(GUI)?

Thanks,
Siva

Linux is a kernel. It is the used in most GNU operating systems.
Unix is an old operating system by AT&T of the end 60's. Since then, it has become a norm and Unix is now a class of compatible operating systems. There are several vendors of unix systems. The two main branches of unix are System-V and BSD. AIX, HP-UX and Solaris are fully Unix compatible as defined by the single UNIX specification published by the open group (the owner of UNIX).
GNU is a unix-like operating system that is not fully compliant with the specification. It doesn't matter because it is becoming the norm nowadays.
The most popular GUI on both UNIX and GNU is XFree and it's variant Xorg.

This gives pretty good colour of where linux fits (near the end)

http://en.wikipedia.org/wiki/Unix