How SunOS, Linux & Unix differs from each other?

Hi,
I have worked on Windows based Oracle database. Now, I have to work on Oracle which is Sun OS based. I have never worked on either of Sun OS, Linux or Unix.
I am confused whether Sun OS is same Unix or Linux? Whet should I learn?
Please help me.
Thanks

so if you are to work with Oracle on Sun OS (Solaris) why not trying out at home ?
You can go with Linux first and after you became a real Unix freak and want to try a VERY userfriendly Unix, you may try Solaris10 on your box. It is Open Source like Linux and can be downloaded free at sun.com (the stable release used for production systems). The newest Oracle releases and patchsets are available for it (32 and 64 bit). It offers some new concepts and (what I like most) is a system usable for home apps up to really big and mission critical applications (you can use it in production systems with 100 or more CPUs).
I am using it even as my desktop system in my office since 2 years.
I got nerved by those Linux-Distributions always doing something in a different way in each new release. But sure, the driver support for some taiwanese hardware there is still better than with Solaris.
Solaris is IMHO not too different anymore in terms of user friendlyness (Gnome is just called Java Desktop System, KDE is also available) and there is a real professional open source community behind it at opensolaris.org. Due to it's kernel qualities there are discussions about releasing Solaris under GPL and creating the GNU operating system from it.

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