in reply to
Re^2: using env vars in Log::Dispatch::Config config files
in thread using env vars in Log::Dispatch::Config config files
My bad. I interpreted your post as a "I can't get the environment variable" and I was showing how to access the environment variable hash. I didn't notice the part of your post when you're talking about reading it from a file. (I had thought that was a bit of the code you were having trouble with.)
When your only tool is a hammer, all problems look like your thumb.