MongoDB - Drop tmp.mr for temporary mapReduce collections

drop.js

db.system.namespaces.find({ name : /tmp.mr/ }).forEach(function(z) {
  try {
    db.getMongo().getCollection( z.name ).drop();
  } catch (exception) {
    try {
      db.getMongo().getCollection( z.name.replace("$", "\\$") ).drop();
    } catch(exception2) {
      printjson({ error : 'error dropping collection', e : exception });
    }
  }
});