path statement and compiler choice

["patrick" <patrick hci utah edu>]

I Thought I understood this but now I guess I do not.
When I run "env" at a bash prompt, I see that my path
contains redundant/repetitive statements (there are
two /usr/bin entries, for instance).  I check /etc/profile
and see that there are none of the redundant entries in
its path statement.  I check my personal .bash_profile 
AND .bashrc and neither contains any path entries that
could account for the redundancies.  

What file do I edit/check to eliminate the redundant 
path entries...or edit to change the sequence in the
path statement?

Second question:  I have egcs-1.1.2 and pgcc-1.1.3 installed,
both via rpm.  Right now, the default compiler used is the
egcs set.  I want to switch to the pgcc set as my default.  
How do I go about this?

patrick