It is a JavaScript shell that allows interaction with a MongoDB instance from the command line. With that one can perform administrative functions, inspecting an instance, or exploring MongoDB.
To start the shell, run the mongo executable:
$ mongod
$ mongo
MongoDB shell version: 4.2.0
connecting to: test
>
The shell is a full-featured JavaScript interpreter, capable of running arbitrary JavaScript programs. Let’s see how basic math works on this:
> x = 100;
200
> x / 5;
20
