MongoDB remove mapreduce collection

Question

Due to error in client code, mongodb have created many \"mr.mapreduce....\" collections, how to remove them all (by mask maybe).

Answer 1

I run script in interactive shell:

function f() {
    var names = db.getCollectionNames();
    for(var i = 0; i < names.length; i++){
    if(names[i].indexOf("mr.") == 0){
    db[names[i]].drop();}}};
f();

It resolved my problem.