... MS-DOS¹

This simple operating system (or its analogues *-DOS) used to be the only one for ``personal computers''. It can be run on these computers (at least simulated) from more sophisticated systems as well, and so most of the programmes written for this old system can be used further on.

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... omitted)²

When using unzip, the -d switch is default -- it may be a good idea, having a batch file doing that for pkunzip as well, i.e., creating always the needed subdirectories.

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