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  1. or download this
    my $vxdg;
    (exists $vxdgs{$node}{$disk})   ? $vxdg=$vxdgs{$node}{$disk}
                                    : $vxdg="";
    
  2. or download this
    my $vxdg = exists $vxdgs{$node}{$disk} ? vxdgs{$node}{$disk} : '';