Well, I think there might be more similarities, but of course, if I'm wrong, feel free to correct me....
Both Amiga and Unix can be controlled entirely from the command prompt, and that the command prompt is always there, even if you can't see it...
the ' . ' and '..' commands to go up one level, and to the root directory respectively... although in AmigaDos it's '/' and ':'
Both have more types of file protection bits than windows (I believe)
And there is more, I'm sure .... hmm, the ixemul.library ...
The Amiga 3000UX won 'Best in Show' at the UnixWorld show, does that count?