require 'rubygems'
require 'systemu'

threads = []

(ARGV.shift || 10).to_i.times do
  t = Thread.new do
    status, stdout, stderr = systemu 'cat', :stdin => ('42' * 1024)
    [status, stdout[0..15]]
  end
  threads << t
end

threads.map{|t| p t.value}