I have a function which looks as follows: 
convertToFile($dir,$name,@data);

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I had a hash that has files as keys and timestamps as values. But now I have changed the hash a little.
The keys of the new hash are directories and the values are the previous hash (meaning keys = files values = time).

hash before:
$newHash{$file} = $time;

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hash after:
$newHash{$dir}{$file} = $time;

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I were passing the hash keys as array to the convertToFile function:
convertToFile($dir,$name,sort(keys(%data)));

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But now it won't work because I need the nested hashes.
I don't care about the order of the hashes I just care about the files.
I want to pass file to a the function and it does not matter from which directory.
I was wondering if its possible to do without any additional loops or code, maybe some special keywords.

Another related small question:
I were using the following syntax to combine two hashes into one:
    %full = (%files1,%files2);

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What if I have two keys (which are directories) that are the same? will it combine the inner hashes?

For example:
$files1 = {
          'ABC' => {
                  'file1' => 6
                  'file2' => 5
                  'file3' => 8 
                }
          'XYZ' => {
                  'file5' => 6
                  'file2' => 5
                  'file8' => 8 
                }
        };
$files2 = {
          'ABC' => {
                  'file1' => 9
                  'file8' => 5
                  'file3' => 8 
                }
        };

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How the new hash will look like?
Thank you

In reply to how to get all keys of inner hashes by ovedpo15

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