如前面所说的那样，selpg是从文本输入选择页范围的实用程序。

As stated earlier, selpg is a utility to select a range of pages from text input.

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“打印”对话框的用户是否可以使用一个选项指定要打印的页范围。

Print dialog box have the option to specify ranges of pages to print.

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然后检查页计数器是否在请求的页范围之内，若是，则写当前行；否则不写。

Then check to see whether the page counter is within the requested range of pages, and if so, write the current line; otherwise do not write.

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