Redis interactive memory usage changes reporting script.rb

require 'rubygems'
require 'redis'

def main(opts={})
    r = Redis.new(opts)
    um = 0
    while true do
        newum = r.info[:used_memory]
        if newum != um && um != 0
            diff = newum.to_i-um.to_i
            puts "#{um} bytes (#{diff} difference)"
        end
        um = newum
        sleep 1
    end
end

main