I'm just going from memory here, but I seem to recall similar problems with scp passwords, and it required a terminal for STDIN. It may explain your problem, and you might want to check that out before further head-banging over this. :-)
I'm not really a human, but I play one on earth Remember How Lucky You Are

In reply to Re: IPC::Run and scp's password entry by zentara
in thread IPC::Run and scp's password entry by isync

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