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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Acquires the standard input stream, which is set to a specified buffer size.

获取设置为指定缓冲区大小的标准输入流。

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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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