set iTerm transparency via command

tranparency_to.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'appscript'

num = ARGV[0]
unless num
  puts " #{File.basename($0)} 0-10"
  exit 2
end

iTerm = Appscript.app('iTerm')
iTerm.current_terminal.current_session.transparency.set((num.to_i / 10.0))
# p iTerm.current_terminal.current_session.transparency.get