> For the complete documentation index, see [llms.txt](https://book.bsdcn.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.bsdcn.org/life/di-si-bu-fen-unix-zhi-wai/10.-unix-fu-wu.md).

# 第 10 章 UNIX 服务

> “代码中只有不到 10% 与系统表面上的用途有关；其余部分处理的都是输入输出、数据校验、数据结构维护以及其他杂务。”—— Mary Shaw

本章讨论 UNIX 服务，例如咨询与分时。[非印刷资料](/life/di-er-bu-fen-unix-xin-xi/5.-fei-yin-shua-zi-liao.md)一章还会介绍更多与教育和培训有关的服务。

与[UNIX 应用](/life/di-si-bu-fen-unix-zhi-wai/11.-unix-ying-yong.md)一章一样，商业 UNIX 服务也可以在 /usr/group 的产品目录中查到。除了这类名录，以及 UNIXWORLD、UNIX REVIEW 之类杂志封底的广告之外，关于这类服务的公开资料明显匮乏。尤其是，本章所列的这些服务，我们没见过任何一篇杂志评测。当然，要对两项咨询服务之类的对象做一次科学的比较，本来就相当困难。

虽然我们无法就这些话题给你硬邦邦、冷冰冰的事实，但可以给出一些一般性的指导原则，外加我们口口相传听来的消息。


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