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  1. or download this
    use Getopt::Long qw(GetOptions);
my $arg1;
GetOptions( 'arg1=s' => \$arg1);
  2. or download this
    use Getopt::Long qw(GetOptions);
my arg1;
...
GetOptions($opt);   #doesn't work  
GetOptions(@opt);   #doesn't work
GetOptions(%opt);   #doesn't work