Copying environment variables

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All,

Is it possible to "copy" an environment variable to another name?
Something like this:

SetEnv foo "bar"
SetEnv baz ${foo}e

Now, "baz" has value "bar".

It doesn't appear to work as written above, but the documentation
doesn't actually suggest you can do that kind of thing.

I have an environment variable whose value I need to copy into another
name. What are my options for doing that kind of thing?

- -chris
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