Finds Drupal files by name and lists out where they are being used (i.e. what nodes or users are associated with it)

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<?php

$fid = db_query("SELECT fid FROM {file_managed} WHERE filename = 'card-1.xls'")->fetchField();

if ($fid) {
  $file = file_load($fid);
  var_dump(file_usage_list($file));

}
else {
  echo "no file found";
}