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 my %hash =(
          'script' => 'foo.pm',
          'params' => {
...
                           },
           'testset' => ['test1']
        );

foreach my $key (keys %hash) {
    if ( ref $hash{$key} ne 'HASH' && ref $hash{$key} ne 'ARRAY' ) {
...
        print"$key:$hash{$key}[0]\n";
    }
}