How can i download old Unix operating system?

Q. Pls give me link for download unix operating system ..

A. You can't, they were propreitary... If you want a new one, FreeBSD is the closest you can get... Also, Linux isn't built from unix, just based on it, but it's much more advanced...

Original Question

which operating systems are belongs to UNIX?

Q. I want to learn C-language on UNIX operating system. But I don't know which operating systems are belongs to UNIX.

A. I think you'd benefit from reading about POSIX

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

Original Question

What are the cons and prons of the following types of computer?

Q. - A Mac OS X with the latest software suite (Snow Leopard i think)
- A PC with the Unix operating system
- A PC with the latest version of the Windows OS (Windows 7)

I really need help with the first two since I have never used them before and a few links/websites would help.

A. Mac - overpriced, inferior hardware, you're locked into Apple hardware, anything other than running files takes knowledge of the Unix shell. There are no advantages.

Unix - you need a knowledge of Unix. No friendly wizards to do it for you. Same as a Mac. (Not surprising, since Mac OSX is FreeBSD, a Unix offshoot.)

Windows - easier to run for 99.99% of computer users. Disadvantage - ease of writing viruses for i, so the average computer user, not knowing how to not download viruses, downloads more of them.

Original Question

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