[R] Prompt with scan()

[john.janmaat@acadiau.ca]

Hello,

I am using R to teach an undergraduate course in
Econometrics.  For class demonstration purposes, I plan
to prepare my scripts and be able to step through them. 
I noticed that the built-in demo prompts for an enter
with what looks like the scan() function, but replaces
the n: prompt with different text.  The on-line
documention does not make it clear to me how to do
this.  Suggestions?

Thanks,

John.
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