您常常会发现它们作为更复杂的命令管道中的一部分(请参见清单2)。

You'll often find them as part of a more complex command pipeline (see Listing 2).

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如果在Linux命令行中执行，perl脚本将构造一个命令管道，如下所示。

The Perl script constructs a command pipeline that, if executed on the Linux command line, looks like this.

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在命令管道中作为组件工作(通过读取标准输入或文件名参数，以及写至标准输出和标准错误)。

Working as a component in a pipeline of commands (by reading either standard input or a filename argument, and writing to standard output and standard error).

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