https://blog.offline-net.com/2010/10/11/macbook%ef%bc%9aterminal%e3%82%92%e4%bd%bf%e3%81%84%e5%a7%8b%e3%82%81%e3%81%a6%e3%81%8b%e3%82%89%e8%a1%8c%e3%81%a3%e3%81%9f%e8%a8%ad%e5%ae%9a/