'scan' in a script?

When I use the scan function in the Rgui console it works as expected.
However it seems that when I put the same command in a script file it
doesn't wait for input.

Is there an option to scan to make it wait for input when used in a
script? Or is there possibly a different function that will do in a
script the same sort of thing as scan does in the console?

Thanks,
Mark

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