看一下管道符前面的代码，它创建文件的字节流并发送到标准输出。

In looking at the previous code before the pipe, a byte stream of the files is created on the standard output.

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调用该函数时，所有进入的字节流已被写入到文件。

When you call this function, all incoming byte streams are written to a file.

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命名文件系统属性分类是一个关联到目录或者文件的字节流，通过一个字符串名引用。

The named file system attribute classification is a byte stream that is associated with a directory or file and is referred to by a string name.

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