Thanks for your answers. Just to clarify. The book is about using the system, not about internals. I see that my mail did say other thing, sic. Our introductory course to SO teachs them how to use the system, this includes programming. Using both the shell and most of the system calls. The reason is that I found that they only really understand the concepts when they use them. I'm trying to teach the concepts in a practical way.
Going back to my question about the top-10, I remember that it was very hard to me to understand why bind / / was there after I did a bind -b whatever / Now it seems clear and very simple, but it was not at all for me initially. I'll save all your comments for another book that I plan to write after I finish the one on programming and using the system. So, thanks again.
