poller.rb

# runs ARGV and puts the output
#
# Example:
# ruby poller.rb date
#
# http://gist.github.com/39729
module Screen 
   def self.clear 
     print "\e[H\e[2J"
   end 
end 

trap("INT") { puts "Goodbye"; exit }

cmd = ARGV.join(" ")
poll_time = 1

while(true)
  Screen.clear
  puts `#{cmd}`
  sleep poll_time
end