$abc_cmd = `abc.exe -i $input_file -o $output_file >null`;

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I don't get this. You're redirecting the output of abc.exe to the file null, and then you want to capture the output of that.

What do you expect $abc_cmd to be afterwards?

In reply to Re^2: Access an executable from perl script by JavaFan
in thread Access an executable from perl script by abcdefg

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