Sending Keystrokes to OS X via osascript, in Ruby

gistfile1.rb

#!/usr/bin/ruby -w

def presskey(keycode)
  system "osascript -e 'tell application \"System Events\" to key code #{keycode}'" 
end

kVK_LeftArrow    = 123     
kVK_RightArrow   = 124
kVK_DownArrow    = 125
kVK_UpArrow      = 126     
arrow_keys = [kVK_LeftArrow, kVK_RightArrow, kVK_DownArrow, kVK_UpArrow]

if $0 == __FILE__
  sleep(3)
  while(true) do
    presskey(arrow_keys.sample)
    sleep(1)
  end
end

gistfile2.sh

# Left Arrow
osascript -e 'tell application \"System Events\" to key code 123'

# Right Arrow
osascript -e 'tell application \"System Events\" to key code 124'

# Down Arrow
osascript -e 'tell application \"System Events\" to key code 125'

# Up Arrow
osascript -e 'tell application \"System Events\" to key code 126'