#!/usr/bin/perl -w

use Data::Dumper ;
use strict ;

my %hash_1 = (
	'abcd' => 'zzz',
	'efgh' => 'zzz',
) ;

my %hash_2 = (
	'2345' => 'zzz',
	'8888' => 'zzz',
	'efgh' => 'zzz',
) ;


print Data::Dumper->Dump( [ \%hash_1 ] ) ;

my %hash_X ;

foreach my $k (  keys( %hash_1 ) ) {
	$hash_X{ $k }->{ 'folder_1' } ++ ;
}

foreach my $k (  keys( %hash_2 ) ) {
	$hash_X{ $k }->{ 'folder_2'} ++ ;
}

foreach my $k (  keys( %hash_1 ) ) {
	$hash_X{ $k }->{ 'folder_1' } ++ ;
}

print Data::Dumper->Dump( [ \%hash_X ] ) ;

print keys( %{ $hash_X{ 'efgh' } } ) ;