The MongoDB Shell is a command line program that comes with the binaries of MongoDB on all platforms. You can run it by executing …
> mongo
In the /bin/ directory of your MongoDB folder.
The shell is (at the core level) a JavaScript interpreter (that is JavaScript not Java) …
You can actually “try” it online without installing anything by going to: http://try.mongodb.org/
Lots more documentation on MongoDB’s website, here.
Intro to the Shell
Watch Mike Dirolf from 10Gen’s presentation(s) on the Shell (also an interesting blog post: Working With Stored JavaScript in MongoDB …)
Mastering the MongDB Shell
Source: http://mongodb.blip.tv/file/3700829/
CRUD and the JavaScript Shell
Source: http://mongodb.blip.tv/file/3591564/
Becoming a Monja
Scott Hernandez’s presentation at Mongo Seattle in July 2010 will show you how to become a MongoDB shell … master.


