A simple ruby script to monitor filesizes during a large transfer. Setup to run through cron. Requires the mandrill-api gem to be installed, as well as a mandrill API key in your enviroment in MANDRILL_APIKEY

fs-monitor.rb

require 'mandrill'
files = ["mh-files-wo-lb-20141026_0009.tar.gz","mh-files-lb-only-20141026_0009.tar.gz"]
files.each do |f|
  if File.exist?(f)
    size = File.stat(f).size
    gb = 1024 ** 3
    mb = 1024 ** 2
    status = "#{size / gb} gb (#{size / mb} mb)"

    puts "File #{f} - as of #{Time.now}:\n"
    puts "#{status}\n"
    m = Mandrill::API.new
    message = {
     :subject=> "Status: #{status} [#{f}]",
     :from_name=> "Your Friendly Neighborhood Server",
     :text=>"See?",
     :to=>[
       {
         :email=> "bill@example.com",
         :name=> "Billy"
       }
     ],
     :html=>"#{status} for #{f}",
     :from_email=>"bobby@example.com"
    }
    sending = m.messages.send message
  end
end