I needed a script/runner equivalent for Sinatra. This works pretty well so far.

runner.rb

#!/usr/bin/env ruby
# If you want to run it on a specific environment, set your RACK_ENV environment variable.

require 'rubygems'
require File.expand_path("../app",__FILE__)

# puts ARGV.options.inspect

if ARGV[0].length > 0 && ARGV[0].is_a?(String)
	puts eval(ARGV[0])
end