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'>pty>' means '&>pty>', not '1>pty>' The pseudo terminal redirects both stdout and stderr ... grab stderr separately, do this: start \@cmd, '<pty<', \$in, '>pty>', \$out, '2>', \$err +;
use IPC::Run qw(run); ... '>pty>', sub { $out .= $_[0]; print STDOUT $_[0] }, '2>', sub { $err .= $_[0]; print STDERR $_[0] }, );