UNIX was defiantly the inspiration for Linux but I think you do a disservice to both when you call Linux *UNIX* it was not until kernel 2.4 / 2.6 that Linux has become a truly enterprise system. And the development model most assisted by Linux (opensource) has produced many applications which UNIX takes advantage (nmap, cvs, ...) Many old unix apps were released into this model and became more viable dynamic due to the model..
see 36, Unix wasn't the "inspiration" it was the blue print.