We are talking about viruses in the era of a pandemic.
Disclamer: This article is written for beginners for beginners! If you are already an established specialist, most likely you will not find anything new here. However, if you read it, criticism (preferably constructive) is welcome.
Conceptual component
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Source: The Evolution of the Unix Time-sharing System, an account of developments during 1968-1973 — Dennis M. Ritchie
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But even on the example of the study I have already written, it is clear how peculiarly the development of malware on Unix-like (in this case, Linux systems, since they are more widespread and used in the learning process) operating systems developed.