It looks like the snippet checks whether a child is still running (by checking if the pipe is still open). system doesn't run a child in parallel, so your suggestion would help. It seems to me the solution would involve fork+exec (not recommended for Windows), system 1, ... (undocumented? Windows only), Win32::Process (Windows only), IPC::Open2, IPC::Open3, IPC::Run or IPC::Run3, but not system.

#Returns the status object of the sync process
    $oExec;
    
    $oExec = system($stepName);
    $ouputStream = "";
    
    while($? eq 0){
        Do While Not oExec.StdOut.AtEndOfStream
           ouputStream = ouputStream & oExec.StdOut.ReadAll
        Loop
         sleep 100;
    }
    Do While Not oExec.StdOut.AtEndOfStream
       ouputStream = ouputStream & oExec.StdOut.ReadAll
    Loop
    #WScript.StdOut.Write ouputStream

    return $oExec;
}
[download]

open( CMD, "$command |" ) or die "Cannot open $command: $!\n";
while ( defined( my $line = <CMD> ) ) {
    # Do stuff with $line which is the output from $command
}
close CMD;
[download]

Or, ikegami has a list of number of good modules that do similar things.

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