Since the output stream is a regular file, it is probably good to remove it at the end.
由于输出流是一个规则的文件，因此最好在结束时将其删除。
If the output stream was stdout, and if it was not redirected to a file or a pipe, the selected pages will appear on the screen.
如果输出流是标准输出，并且没有被重定向至文件或管道，则选定的页将出现在屏幕上。
If the output stream was stdout, and if it was redirected to a file, the selected pages will be in that file.
如果输出流是标准输出，并且被重定向至一个文件，则选定的页将在该文件中。
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