Possible Duplicate:
How to determine where an environment variable came from

I wonder if there is a way to determine the location of the file where certain configuration exists. For example know that I have a global parameter TMOUT and I want to change it, but I don't know WHERE it is configured. I'm aware of this question which already was asked here, however I'd like to know if there any other way available except investigating the order of variables appearance according to the env command.