On Monday, September 18, 2017, <ra...@strausses.net> wrote:
>
> But if the variable is not set, I want the script to prompt for
> it.


In version 10 this should be doable, we introduced \if conditionals.  You
might be able to hack up something via "\!" in 9.6 and earlier (haven't
tried it myself).

David J.

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