It depends on what format the graphical files are in. The "convert" program can turn most common graphics formats into something printable, and the "lpr" program will send them to the printer.

        convert my-chart.gif my-chart.ps
        lpr my-chart.ps
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You can do that in one step from perl like so:

        system("convert my-chart.gif ps:- | lpr") == 0 or die $!;
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If the charts are in an Excel spreadsheet or something, then that's doable, too, but a different question.