How to get mongo command results in to a flat file

Question

How do I export the results of a MongoDB command to a flat file

For example, If I am to get db.collectionname.find() into a flat file.

I tried

Answer 1

mongoexport --host 127.0.0.1 --port 27017 --username youruser -p yourpass \
   -d yourDatabaseName -c collectionName --type csv \
   --fields field1,field2 -q '{"field1" : 1495730914381}' \
   --out report.csv