There are a few things that would get in the way:

• if your DIR handle was opened like this:

  my $path = "some/path"
  opendir( DIR, $path );
  [download]

  then your unlink has to be like this:

  unlink "$path/$filename";
  [download]

• if the directory indicated by $path has write permission turned off (for the user running the script at least), the script won't be able to delete (or add or rename) files in that directory.

Note that the permissions on the data file itself do not matter for "unlink" -- only the permissions on the directory containing the data file are important.

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