Timer using say command

timer.rb

#!/usr/bin/env ruby

USAGE = "$ ruby timer.rb time time ..."

if ARGV.length == 0 then
  puts USAGE
  exit
end

tl = []
for arg in ARGV 
  tl << arg.to_i if arg.to_i > 0
end

i=0
while true 
  print "#{i} minutes.\n"
  if tl.index(i) != nil then
    system("say #{i} minutes.");
    tl.delete(i)
  end
  break if tl.length == 0
  sleep 60
  i=i+1
end

puts "#{i} minutes. Finish!"
system("say #{i} minutes. Finish!")