network pinging over child processes

pinger output

time ruby pinger.rb 
192.168.1.4
192.168.1.59
192.168.1.90
192.168.1.100
192.168.1.101
192.168.1.102
192.168.1.103
192.168.1.105
192.168.1.107
192.168.1.136
192.168.1.145

real	0m1.174s
user	0m0.027s
sys	0m0.077s

pinger.rb

require 'ipaddr'

ips = IPAddr.new("192.168.1.0/24").to_range

children = ips.map do |ipaddr|
  ip = ipaddr.to_s
  pid = spawn("ping -q -W 1 -c 1 #{ip}",
              [:err, :out] => "/dev/null")
  [pid, ip]
end

children.each do |pid, ip|
  # end child process & update $? (process exit status)
  Process.wait(pid)

  # 0 pinged / 1 no reply / 2 errors
  puts ip if $?.exitstatus.zero?
end

THIS IS AWESOME