Path/env question...and choosing compiler

["Patrick O'Neil" <patrick hci utah edu>]

I used to think I understood this but now...

If I type "env" at the prompt, I get a nice display of
my current environment settings.  Problem is, in my path
there are several redundant/repeated entries.  I have 
checked my personal .bash_profile and /etc/profile.  In
neither can I see a number of the PATH entries, particularly
those that are duplicated.  What files do I need to 
open/edit to rearrange the order in PATH AND to remove 
the duplicate entries?

Related question.  I have egcs-1.1.2 and pgcc-1.1.3 installed.
Presently, egcs is the default when I use gcc, etc.  How
do I change the default compiler set to be pgcc?

patrick