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Reviving the 1973 Unix Programmer's Manual
The 1973 Fourth Edition of the Unix Programmer’s Manual doesn’t seem to be available online in typeset form. This is how I managed to recreate it from its source code.
Diomidis Spinellis
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The evolution of Unix architecture in two diagrams
Today I put online two diagrams depicting the architecture of the Unix operating system , one for the 1972 First Research Edition and one for FreeBSD, one of its direct descendants. Here are the details on how I created these diagrams.