In addition to the scoping issue with file handles that Zaxo caught, you have a runaway scoping problem with $_.

Instead of letting it change out from under you as you recurse, try writing 

  while ( my $file = readdir DIR ) {
      ...

[download]
and eliminate your use of $_ altogether.

In reply to Re: Recursive tree walk with scoping issues by dws
in thread Recursive tree walk with scoping issues by Lhamo Latso

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