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Super Dimension Fortress
(SDF，也称为 freeshell.org) 是Internet上的一个非盈利公共访问UNIX shell 提供商。自 1987 年以来，它一直在持续运营。
SDF可以做很多事情，例如拨号，托管网站，收发邮件,与世界各地的人在线聊天、玩玩游戏都可以，服务器的系统为FreeBSD,一切功能的实现都依靠命令行，如果你已经习惯Linux，使用UNIX并不难，如果是想学习UNIX这是一个较好的选择。
注册方法
打开网址：https://sdf.org/ 或者 http://freeshell.org/ 直接填写邮箱和登录名称，确认即可注册。我的建议是在主站注册，日本站就已经明确说明免费120天。而上面两个网址则没有说明免费期限，即为永久免费。
注册后，请在邮箱中查找来自SDF的邮件，极有可能是在垃圾箱中，里面给出了服务器登录的方法，包括用户名和密码。
使用ssh工具，直接登录即可。
操作建议
一款持续提供35年的服务商是值得尊敬的，如果有条件可以赞助一下；筹款商店还有光盘和徽章售卖。终身会员只要36刀！
新人可以看看freeBSD的文档，对于提升有很大帮助：https://docs.freebsd.org/doc/ 对于英文头疼的小伙伴看看中文社区提供的帮助https://book.freebsdcn.org/
更多有趣功能，自己开发吧~
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