@f = File.open("log.txt","a+")
def start; @f.puts 'started at: '+(@t=Time.now).to_s end
def lap; @f.puts 'passed: '+(Time.now-@t).to_s end
def stop; lap;@f.close;'s' end
while !(send($<.gets.chop.to_sym) rescue stop); end