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