open3.rb

require 'open3'

command = 'sh'

Open3.popen2e(command) do |stdin, stdout_and_stderr, wait_thread|
  Thread.new do
    stdout_and_stderr.each {|l| puts l }
  end

  stdin.puts 'ls'
  stdin.puts 'sleep 1'
  stdin.puts 'ls'
  stdin.close

  wait_thread.value
end