Two errors:
  1. in outerr.pl, autoflush is not set,. Just do this: 
    use IO::Handle;
STDERR->autoflush(1);
STDSTD->autoflush(1);

    [download]
  2. the sequence of parameter to open3 is: out, in, err. You gave the wrong sequence. This is something confusing, have to be careful, as the sequence of the first two parameters to open2 and open3 are reversed.
I tested it, and it worked.

In reply to Re: IPC::Open3 confusion by pg
in thread IPC::Open3 confusion by xafwodahs

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