Copy few documents in a collection to another collection in mongo DB

Question

I have two collections , one where all documents are stored and the other where the documents will be stored after processing. I am new with mongo and would like to know if there is any method to copy the documents from one collection to the other ?

Answer 1

Try this:

db.firstColllection.aggregate([
    {$limit: 10},
    {$out: "secondCollection"}
])

Answer 2

To copy all files, we can use db.source.copyTo("target") as well