You want to say that from cmd.exe copy 'from' 'to' /z reports on progress as it does the copy but when run via Perl's pipe-open it does not update the output until it finishes? In some OSs I find my luck runnning out faster than in others ...

In reply to Re^5: Reading progress of "copy" executed asynchronously by bliako
in thread Reading progress of "copy" executed asynchronously by neWerminder

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