The UNIX CD Bookshelf

UNIX Power Tools
UNIX in a Nutshell: System V Edition
Learning the vi Editor
sed & awk
Learning the Korn Shell
Learning the UNIX Operating System

above online books are available at http://doc.novsu.ac.ru/oreilly/unix/index.htm

Unix Vi Commands

list of vi commands at
http://spreadsheets.google.com/pub?key=pekeaZVmTcB2YJBisxgDnHw