system $_ => '-c', 'echo good';

Nothing to do with the OP's problem (and I apologise for intruding), but I'm wondering why you've written the system command that way as opposed to (say) either:

system $_ => '-c' => 'echo good';
or
system $_, '-c', 'echo good';
[download]

Is it a stylistic preference, or is there a practical advantage in writing it the way you've chosen ?

For me, all three of those alternatives work equally well on both Windows and Ubuntu.
Admittedly, there's quite a few shells specified there that I don't have.

Cheers,
Rob