while trying this mongo command in ubuntu I am getting this error.
ritzysystem@ritzysystem-Satellite-L55-A:~$ mongo
MongoDB shell version: 2.6.1
Mongo 3.*.* - OSX - 2017
From README
RUNNING
Change directory to mongodb-osx-x86_64-3.*.*/bin
To run a single server database:
$ mkdir /data/db
$ ./mongod
Go to new Terminal
$ # The mongo javascript shell connects to localhost and test database
$ # by default -Run the following command in new terminal
$ ./mongo
> help