bash-4.2$ cat dump
use Data::Dumper;

my %hash =(
          'script' => 'foo.pm',
          'params' => {
                             'err' => '99',
                             'FILE' => 'fileA'
                       },
          'par_global' => {
                                'err' => '99',  
                                'FILE_READ' => 'fileB',
                           },
           'testset' => ['test1']
        );

print Dumper( \%hash ) . "\n"; 

##</code><code>##

 
bash-4.2$ perl dump
$VAR1 = {
          'params' => {
                        'FILE' => 'fileA',
                        'err' => '99'
                      },
          'script' => 'foo.pm',
          'par_global' => {
                            'FILE_READ' => 'fileB',
                            'err' => '99'
                          },
          'testset' => [
                         'test1'
                       ]
        };