irbもどき　サーバーとクライアントつくってソケット通信させてみた感じのやつ　http://d.hatena.ne.jp/keyesberry/20110929/p1 　と　http://log.noiretaya.com/199　などを参考にしますた

repl_client.rb

#encoding:utf-8
#repl_client.rb
require 'socket'
require "pp"
server = TCPSocket.open("localhost", 60000)
# sleep 1000
loop do
	print "=>"
	code=STDIN.gets
	if code.include?("exit")==true
		server.puts code
		break
	end
	puts
	server.puts code
	code=""
	begin
		puts server.recv(1024)
	rescue
		puts "Client で ERROR 発生"
	end
end
server.close

repl_server.rb

#encoding:utf-8
#repl_server.rb
require "socket"

server = TCPServer.new(60000)
loop do
  client = server.accept
  begin
    $stdin, $stdout = client, client
    loop {
		code=eval gets
		puts code
	}
  rescue
  ensure
    client.close
    $stdin = STDIN
    $stdout = STDOUT
  end
end