Using Ruby to spawn multiple processes, communicate with them and wait/join the threads

spawn.rb

arr = []

10.times do |i| 
  cmd = "ping -c #{(rand(0)*10).to_i + 1} 127.0.0.1"
  pid = spawn(cmd, {out: "/dev/null"})
  puts "#{pid}\n"
  arr[i] = Process.detach(pid)
end

arr.each { |t| t.join; print "#{t.status}: #{t.pid}" }