On Monday, September 18, 2017, <randy(at)strausses(dot)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.