A Small C Program

* convert output to legible date:
date -d @1363468817 +%c

Ruby

* install current Ruby version:
rbenv install 2.0.0-p0

* define default Ruby version:
rbenv global 2.0.0-p0

Build a Web Application with Sinatra

* install the Sinatra gem:
gem install sinatra

* test Sinatra app (access in browser at http://localhost:4567/):
require 'sinatra'

get '/' do
  'Hello world!'
end
}

Populate a Database with Measured Values

* create new database file db.sqlite3:
sqlite3 db.sqlite3 'create table temperatures(time integer, t real);'

All Together Now

* make cron.hourly executable:
sudo chmod a+x crontab_pi

Extensible

* download and test weather app source:
git clone git://github.com/rheikvaneyck/rnexus.git