How do I find some file or somepackage ?
find. See the
appropriate man page for more detailed information on those commands.
Is there a list of commands somewhere?
Sometimes the people mean just basic unix commands in which case I point them at one of our intro to unix books. Other times the person really wants to know what all software we have available, what they can do on the Internet, etc. etc. etc. (I get this question during tours too which is why I made the TCC software page.)