Need to upgrade my understanding

[Bob Calbridge]

Having gone as far as I can go with a beginners book on Unix and C I need
to take a step up in both.  Rather than ask random questions to the net 
when a problem arises I would rather have the name of some commonly 
available books that take an orderly approach to understanding the innards
of both.  I'm particularly interested in pipes and their implementation, but
I need to find out all I can without taking potshots at the AT&T manuals.
Thanks in advance.
Best,
Bob