> someone mantion last month about a good unix book can I have the name again
>  and also is there any good command reference book

The _UNIX_System_Administration_Handbook_ by Nemeth, Snyder, Seebass, and 
Garth (get the 2nd edition, the "Red Book").  It's wonderful.

I'd just use the manual pages for a command reference (they are pretty 
much the authority on any command on the system, and there is no 
published book pertaining exclusively to NetBSD, so...)

I hope this helps.

Later.

-- 
Colin Wood                                      ender@is.rice.edu
Consultant                                        Rice University
Information Technology Services                       Houston, TX