Oracle 8i & Unix Performance Tuning (http://www.amazon.com/exec/obidos/ASIN/0130187062/qid=980199858/sr=1-1/ref=sc_b_1/105-1933653-5403960 ) is an absolute bible for running Oracle on Unix.

Although nobody likes the titles, Unix for Dummies ( [url]http://www.amazon.com/exec/obidos/ASIN/0764504193/qid=980199946/sr=2-1/ref=sc_b_1/105-1933653-5403960)[/url] and Unix for Dummies Quick Reference ( [url]http://www.amazon.com/exec/obidos/ASIN/0764504207/qid=980199946/sr=2-2/ref=sc_b_2/105-1933653-5403960[/url] ) are excellent references.

Depending on the level of the reader, I also recommend Learning the Unix Operating System ( [url]http://www.amazon.com/exec/obidos/ASIN/1565923901/qid=980200034/sr=2-1/ref=sc_b_1/105-1933653-5403960[/url] )