After setting the external port configuration, type exit twice to back out of the configuration mode of the command line.

在设置外部端口配置之后，输入exit两次，退出命令行的配置模式。

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This would normally be done by setting the Emacs variable sgml-validate-command, and in fact we will set this variable to handle the case of using OpenSp's onsgmls executable to validate in sgml-mode.

这通常是通过设置Emacs变量sgml - validate - command来完成的，实际上，我们将设置该变量以处理在sgml方式下使用OpenSp的onsgml可执行文件进行验证的情况。

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