External commands are just files in your file system.
外部命令就是指文件系统中的文件。
These commands are similar, but provide different interfaces to the external program you're running.
这些命令是相似的，但为您运行的外部程序提供不同的界面。
As you have known, all DOS commands are classified as either internal or external.
正如你们已经了解到的，全部DOS命令可归类为内部命令，或外部命令。
As you have known, all DOS commands are classified as either internal or external.
正如你们已经了解到的，全部DOS命令可归类为内部命令，或外部命令。
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