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  1. or download this
        use Getopt::Long;
        GetOptions(
           'single=s' => \(my $single = ''),
            'multi=s' => \(my @multi  = ()),
        );
    
  2. or download this
        use Getopt::Long;
        GetOptions(
           'single=s' => \(my $single = ''),
            'multi=s' => do { use vars '@multi'; \@multi },
        );