to get the return value of a system command, just do: my $returnValue = system(...); and determine if the code is what you want/expect.
Of course, in your specific example, why don't you just do a DOS MOVE instead of a COPY & unlink ? Again, you can capture the return codes from each move to put into a hash to know the number of files successfully and unsuccessfully moved (I'm assuming that's what you're using the $i++ for.
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