I think you mis-understood my first point above. The whole idea of using the multi-arg form of
system is to avoid shell processing. The (small) price you pay for this is that you can't do redirection or piping like you might using the single-arg form.
In your code snippet above, you are effectively calling perl and passing it 4 arguments, the last three of which it won't know what to do with.
If I understand correctly what you are trying to achieve, then I would suggest that you need to modify your prn_to_file.pl script so that it accepts two arguments. The first will be the text to be printed, and the second will be the name of the file it prints to. Then you make your system call as per my previous example.
Cheers,
Darren
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