Write a simple init.d ruby startup script

file.rb

#!/usr/local/bin/bootup_ruby 
# this is /my/daemon/file

require 'rubygems'
require 'daemons'
Daemons.run('main.rb')

#main.rb is the real script

mydaemon.rb

#!/usr/local/bin/bootup_ruby 
# This is the /etc/init.d/mydaemon file

APP_NAME = 'MyScript'  
APP_PATH = '/my/daemon/file'
case ARGV.first     
  when 'start' 	
    puts "Starting #{APP_NAME}..."
    system(APP_PATH, 'start')
  when 'stop'
    system(APP_PATH, 'stop')
  when 'restart'
    system(APP_PATH, 'restart')
end 

unless %w{start stop restart}.include? ARGV.first
  puts "Usage: #{APP_NAME} {start|stop|restart}"
  exit 
end