Stdin is the standard input stream, which provides input to commands.

stdin是标准输入流，为命令提供输入。

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Many text processing commands (filters) can take input either from the standard input stream or from a file.

许多文本处理命令（过滤器）可以从标准输入流或从文件中获取输入。

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When output is created from multiple files or the standard input stream, the current date and time are used instead of the filename and creation date.

当从多个文件或标准输入流创建输出时，可以使用当前日期和时间替换文件名和创建日期。

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