Hello-MongoDB.db

Hello MongoDB!

As per regulations, you should start with an "Hello, World!" program.

But first, let's set some expectations.
MongoDB is a new, internet-scale born database. It does not
yet have out of the box GUI tools. We'll be exploring the database 
in a `text-mode`, using a Linux/OSX shell or Windows command prompt.
Start a mongod. Working in this mode is actually just the same as 
the drag-and-drop, windowy, GUIs you might be used to. Just think about
where you are (what directory in the file system) and, when executing
binaries how the shell will interperate what you are typing ($PATH 
evironment variables, location of files/directories in command arguments).
This new text-world may seem daunting at first, but actually, after some
practice, you will find new levels of productivity working in this mode.
You'll also be able to have 100% confidence.

Your installation of MongoDB consists of a dozen-plus executable binaries,
found in the {{bin}} directory of where you unzipped the downloaded kit.
Each of these binaries has a special purpose. We'll start with two of the 
most popular binaries {{mongod}} and {{mongo}}. 

{{mongod}} is the core database deamon. That means that it's a program
meant to run on a server and accept network connections from clients.
Once such client is the {{mongo}} binary. {{mongo}} is an interactive
shell which connects to a {{mongod}} and allows you to do all kinds of 
things with data like queries, updates. You can also do database 
administration and performance analysis. 

The {{$}} indicates an operating system shell. {{>}} denotes commands 
entered into the Mongo shell.

You're going to fire up a real {{mongod}}. It will need a place to put
your data - create a directory to store the raw data files.

Fire up your shell. Where are you in your file system? Think about
where you'd like MongoDB to put it's datafiles. For learning purposes, 
it's good to use your home directory and do something like this:

$cd ~
$mkdir mongo-data

Now we have a place for data. Next, 

$cd <path_to_your_mongodb_installation>
$cd bin     // since that's where the binaries are, or you can add this 
            // directory to your $PATH

(Alternatively, of course, you can just know where you Mongo binaries are
and give full paths to them in your shell.)

Start a mongodb, listening on the __default__ port 27017, putting data files
into ~/mongo-data, and logging to the console (writing log data into the shell
standard output).

$./mongod --dbpath ~/mongo-data

You should see logging output in your console window.
Let's connect to that {{mongod}}, fire up another shell.
Get to, or enter the full path to {{mongo}}.

$./mongo

This will start a shell session. How does {{mongo}} know how to connect
to {{mongod}}? Good question!! It knows because MongoDB uses lots of __defaults__
for different parameters. In this case, {{mongo}} uses the default {{hostname}}
of {{localhost}} and the default {{port}} of {{27017}}. These default happen to
work, since that's hwo we started our {{mongod}}. You should see something like:

MongoDB shell version: 3.1.1
connecting to: test
>