The easy way would be to use a database like SQLite or to use another kind of temporary file to which your program writes and your friends program reads from. Good formats for structured data would be CSV (Text::CSV_XS) or JSON JSON::XS.

The best approach is to talk to your friend what format they can read most easily.

In reply to Re: Returning data to parent program by Corion
in thread Returning data to parent program by james28909

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