environment variables

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Hi All,
    I have a script that set environment variables for 10 plus
configuration and each configuration share some environment variable and
have some different or specific environment  variables for a particular
configuration. I set the env variables before calling each thread, but I
notice that the environment variable inherits the previous
configurations environment setting.
Example:
configure 1:
set 11 variables
 
Configure 2:
set 10 variables, all of of configure minus 1 specific variable
 
But configure 2 has all eleven variables.
 
Is there a way to delete the environment variables before setting each
configuration?
 
I tried 
undef (%ENV)
SETENV ();
 
but no luck?
 
Also, I read that environment variables in Linux are cached? If it true,
is there a way to clear the cache without rebooting the system?
 
Any ideas how I can delete all the environment variables before setting
them again for the next configuration? 
 
thanks in advance.




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