例如， 图 2 说明如何通过管道连接 find、grep 和 wc 命令，从而寻找名称以小写字母 a 开头的所有文件并统计其数量。

For example, Figure 2 shows how a find, grep, and wc command might be connected via pipes to find and count all files with names that begin with lowercase a.

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有时，您不知道您在寻找的元素的名称，或者需要找到一个可能在几个不同元素中的元素。

Sometimes you don't know the name of the element you're looking for, or you need to find an element that might be inside of several different elements.

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通过名称服务寻找服务器。

Find servers from a name service.

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