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  1. or download this
    use strict;
use warnings;
...
my $xyz = exists $hash{xyz} ? $hash{xyz} : 0;

print "ABC = $abc : XYZ = $xyz\n";
  2. or download this
    ABC = 123 : XYZ = 0
  3. or download this
    my $vxdg = exists $vxdgs{$node}{$disk} ? $vxdgs{$node}{$disk} : "";