Get CPU usage

PLAYDOUGH_CPU.rb

#!/usr/bin/env ruby 
require 'json'
cpu = `mpstat -P ALL`
cpuLines = cpu.split("\n")[3..-1]
max = 0
cpuData = cpuLines.map{|s| [s.split(" ")[2], s.split(" ")[3]]}.reduce({}) do |acc, s|
   key = s[0] == 'all' ? 'total' : "cpu#{s[0]}"
   acc[key] = s[1].to_f unless key == 'total'
   max = [max, acc[key]].max unless key == 'total'
   acc
end
cpuData['max'] = max

puts cpuData.to_json.gsub(/"/, "'")