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  1. or download this
    my $tag = 'foo';       # option variable with default value
GetOptions ('tag=s' => \$tag);
  2. or download this
    my $listref = ['a','b','c'];       # option variable with default valu
+es
GetOptions ('list=s{,}' => $listref);
  3. or download this
    my $listref = [];       # no default
GetOptions ('list=s{,}' => $listref);
my $listref = @{$listref} ? $listref : ['a', 'b', 'c']; # DIY default