This is ruby practice using sinatra.
cd
rvm 1.9.2
rvm gemset create sandbox
rvm 1.9.2@sandbox
git clone git://gist.github.com/1756617.git sinatra
cd sinatra
gem install sinatra
ruby app.rb -p 3000 2>&1 > /dev/null &
curl localhost:3000/
# Welcome, Rackhub.
ps aux | grep app.rb | head -1 | awk '{print $2}'|xargs kill -9