gistfile1.rb

##
# File watcher
#
# Example for: https://twitter.com/rakaur/status/107070299400441858
#
loop do
  if File.exist?('tmp/restart.txt')
    # TODO: add here code to reboot

    # Remember to remove restart.txt to prevent loops
    File.rm('tmp/restart.txt')

    # Exit from loop
    break
  else
    # Sleep a 1 second
    sleep 1
  end
end