Ruby ping logger

pingup.rb

server = "google.com"
cmd = "ping -c 1 #{server}"
while true do
  `#{cmd}`
  if ($?.exitstatus != 0)
    puts "Down: " + Time.now.to_s
    while ($?.exitstatus != 0) do
      `#{cmd}`
    end
    puts "Up:   " + Time.now.to_s
  end
end

# usage & sample output:
#
# $ ruby pingup.rb 
# Down: 2011-07-28 09:51:24 -0600
# Up:   2011-07-28 09:51:24 -0600
# Down: 2011-07-28 09:51:40 -0600
# Up:   2011-07-28 09:52:35 -0600
# Down: 2011-07-28 09:52:49 -0600