I want to create a new database in Mongo. However, I'm having trouble connecting: 

```
:~$ mongo
MongoDB shell version: 1.6.5
connecting to: test
Tue Dec 21 18:16:25 Error: couldn't connect to server 127.0.0.1 (anon):1154
exception: connect failed

```

How can I connect to mongo in order to create a new database? Alternatively, can I create a new database from the command line?

Slightly surprisingly, the [Mongo docs](http://www.mongodb.org/display/DOCS/Databases) don't seem to cover how to create a database.

Thanks.