So just use variables.

# Iterate millions of input/output file names...
foreach (...) {
    # Execute external command on pairs of input/output file names...
    system("my_program.exe my_parameter_file.par -option1 -option2 \
            $input_file_name $output_file_name");
}

[download]

Where is the list of millions of input and output file names coming from?

In reply to Re: external program variables by Jim
in thread external program variables by welle

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