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thanks choroba and QuillMeantTen. I am still confused. what is its value of "$hash" after performing "unshift @queue , map {$_, $hash} @new_paths;" And I always feel that the value of "$hash" is "undef" all alone, because "map" seems not to be able to assign a value to $hash.

root@TestMachine:~/excerise_perl# perl $VAR1 = { 'test' => { 'file2' => undef, 'file1' => undef, 'dir1' => { 'file3' => undef } } };
as the result from above, How does $$data->{'test'} point to its child directory.

In reply to Re^2: who can help me for a very interesting perl program by Anonymous Monk
in thread who can help me for a very interesting perl program by Anonymous Monk

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