Capistrano::Configuration.instance(:must_exist).load do
  desc "tail production log files" 
  task :tail_logs, :roles => :app do
    run "tail -f #{shared_path}/log/production.log" do |channel, stream, data|
      puts  # for an extra line break before the host name
      puts "#{channel[:host]}: #{data}" 
      break if stream == :err    
    end
  end
end