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。
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。
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。
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。
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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