Get mem usage

PLAYDOUGH_MEMORY.rb

#!/usr/bin/env ruby 
require 'json'
memstr = `free`
memPieces = memstr.split("\n")[1].split(" ")
memData = {
   :available => (100*memPieces[1].to_f/1000).round/100.0,
   :used => (100*memPieces[2].to_f/1000).round/100.0,
   :free => (100*memPieces[3].to_f/1000).round/100.0,
   :shared => (100*memPieces[4].to_f/1000).round/100.0,
   :buffers => (100*memPieces[5].to_f/1000).round/100.0,
   :cached => (100*memPieces[6].to_f/1000).round/100.0
}

totalUsed = memData[:available] - memData[:free]

usedPct = totalUsed.to_f / memData[:available].to_f
memData[:used_state] = usedPct >= 0.80 ? 3 : (usedPct >= 0.50 ? 2 : 1)

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