Blog post: The profusion of things that could be in your $PATH on old Unixes https://utcc.utoronto.ca/~cks/space/blog/unix/OldPATHProfusion
Disclaimer: some modern Unix environments also have a lot of things on $PATH, but I think they tend to be things in $HOME (or other personal work areas). Unless your system goes wild with /opt/* or the like.
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