lost man pages after reinstalling and upgrading macosX

[John Minter]

Since I have reinstalled macosx (v 10.2) and upgraded to current v 
10.2.8, i no longer can reach my man pages or many of my commands. on 
startup of terminal i get message saying system cannot find manpath or 
grep.  I have tried to track down the problem, but can't seem to get 
the system to recognize many of my basic commands, including cp and 
man, for example. Please help. I'm a newbie to UNIX, and have been 
reading trying to learn it. I understand the mac's darwin is based on 
BSD. Thanks and forgive me if I've intruded on this list with an 
improper question.

"Everybody does it, but only a few do it well!"
John Minter, Chief Writer
A Writing Studio
P.O. Box 563294
Charlotte, NC 28256
704-891-3052