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2. I'm not 100% sure whether Unix and Linux use the same interface.
whether you are talking about a GUI or a CLI, there is no 'one' interface for linux or unix. supposedly BASH is suppost to be THE shell for linux, however it just comes down to your personal preference. KDE and GNOME, full desktop environments run on many unices, as well as many window managers.
people may disagree with me, but linux IS a unix. notice i say 'A' linux. as in there are many. you could go with one of the *BSD's or one of the many many linux distros, or you could shell out the money for a commercial unix distribution. it is all really up to you in the end. try a bunch.
if you are looking for a linux distro to learn with, suse is very easy to get up and running. suse is what got me started in linux, and i still use it today for my desktop.
when you ask people for what they think about which one to choose you will get many many different answers. look for one you like and try it out.
linux on the laptop will be my next project, when i get the money to buy a laptop.
oh one more thing,
no matter what you choose, DONT GIVE UP! dont be afraid to ask questions, the more people using linux or another unix-like OS the better. with a larger user base it only gets better. we will have larger vender hardware support, and the distros will just keep advancing faster and faster.