I wholeheartedly agree with this blog post. I believe someone on here yesterday was asking about config file locations and setting them manually. This is in the same vein. I can’t tell you how many times a command line method for discovering the location of a config file would have saved me 30 minutes of googling.
I don’t know if you mean on linux but in my experience I have found the bottom part of the first man page usually has a section on config file locations.