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    my $cmdOutput = openCommandAsInput( )
...
if( $cmdOutput->pending ) {
    my $line = $cmdPutput->dequeue() or last;
    ...
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    my $cmd_fh = open_pipe_command( $cmd );
...
if( $cmd_fh->can_read ) {
    my $line = $cmd_fh->readline or last;
    ...