sshtest.rb

# -*- coding: utf-8 -*-
require 'net/ssh'

Net::SSH.start(HOSTNAME, USERNAME) do |ssh|
  ssh.open_channel do |channel|
    channel.exec('ruby') do |ch, success|
      abort 'cannot execute ruby' unless success

      ch.on_data do |c, data|
        $stdout.puts("received #{data}")
      end

      ch.send_data(<<-RUBY_CODE)
        p($stdin.read)
      RUBY_CODE
      ch.send_data("\C-d\n")
      ch.send_data("one\n")
      ch.send_data("two\n")
      ch.send_data("three\n")
      ch.eof!
    end
  end

  ssh.loop
end