The command is executed once for each input file.

该命令对每个输入文件执行一次。

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Listing 1 provides a complete example by looking for the longest word in a particular file passed in from the command line as input.

清单1提供了一个完整的示例，该示例将在特定文件中查找从命令行作为输入而传入的最长单词。

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This input can come either from a file specified as the last command line argument, or from standard input if no file name argument is given.

该输入可以来自作为最后一个命令行参数指定的文件，在没有给出文件名参数时也可以来自标准输入。

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