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Why can't they just call it input or output?
This is more of a historical question I think than a programming question.
因为您可以更改程序的 IO 行为方式,例如通过网络读取字节或写入文件。STDIN 和 STDOUT(和 STDERR)是默认值。或者,如果你愿意,标准。
阅读本文档 标准输入/输出的来龙去脉