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Some important questions to ask are
Is this distribution going to be around in five years?
Is this distribution going to stay on top of the latest security patches?
Is this distribution going to release updated software promptly?
If I have problems, will the vendor talk to me?
因此要取得一些重要问题的答案
该发行版能够在今后5年内继续存在吗？
该发行版会持续有更新的安全补丁吗？
该发行版会迅速发布更新软件吗？
如果我有问题，发行商会搭理我吗？
Viewed in this light, some of the more interesting, offbeat distributions don’t
sound quite so appealing. But don’t count them out: E*Trade, for example, runs on Gentoo Linux.
有了这样的认识再来看，有些更有意思、规模更小的发行版本就不太有吸引力了。但是也别把它们排除在外：例如E*Trade就运行在Gentoo Linux上。
The most viable distributions are not necessarily the most corporate. For example,
we expect Debian Linux (OK, OK, Debian GNU/Linux!) to remain viable for a long time despite the fact that Debian is not a company, doesn’t sell anything, and offers no formal, on-demand support. Debian itself isn’t one of the most widely used distributions, but it benefits from a committed group of contributors and from the enormous popularity of the Ubuntu distribution, which is based on it.
最有生命力的发行版本并不一定是最商业化的发行版本。例如，我们认为Debian在相当长的一段时间里是会存在的，尽管Debian并不是一家公司，既不销售任何东西，也不正式提供需要的支持。Debian本身并不是一种广泛使用的发行版本，但是它利益于有一个坚定的贡献群体，也得益于Ubuntu这个基于Debian的发行版本的盛行。
1.5 EXAMPLE SYSTEMS USED IN THIS BOOK
1.5 本书使用的示例系统
We have chosen three popular Linux distributions and three UNIX variants as our
examples to discuss throughout this book: Ubuntu Linux, openSUSE, Red Hat Enterprise Linux, Solaris, HP-UX, and AIX. These systems are representative of the overall marketplace and account collectively for an overwhelming majority of the installations in use at large sites today.
我们已经选择了3款Linux发行版本和3款UNIX变体，把它们作为我们全书讨论所采用的示例系统：Ubuntu Linux, openSUSE, Red Hat Enterprise Linux, Solaris, HP-UX, and AIX。这些系统是整个市场的代表，它们加起来占据了现如今投入使用的系统的绝大多数。
Information in this book generally applies to all of our example systems unless a
specific attribution is given. Details particular to one system are marked with the
vendor’s logo:
除非指定一种特定发行版本，否则本书中的内容一般适用于我们用作示例的所有发行版本。只适用于某种特定发行版本的细节将采用发行商的徽标来标记：
These logos are used with the kind permission of their respective owners. However, the vendors have not reviewed or endorsed the contents of this book. The paragraphs below provide a bit more detail about each of these example systems.
这些徽标的使用已经分别得到其拥有者的善意许可。不过，这些厂商没有复查或者提供本书的内容。下面的段落对每种示例系统稍加说明。