How to execute mongodb command from cron?

Question

linux

It is necessary to perform a couple of times a day to clear the cache from under the crown to delete the collection of documents.
I can configure cron, how to execute the order of these actions from the console with one command?

sudo mongo
use dbname
dbname.cache.drop()
exit

Answer 1

mongo dbname --eval "dbname.cache.drop()"

Answer 2

stackoverflow.com/questions/4837673/how-to-execute...
look at this.. might it work?