Blog post: Command hashing in Unix shells is probably no longer worth it https://utcc.utoronto.ca/~cks/space/blog/unix/DropShellCommandHashing
tl;dr: command hashing was a speed hack invented by csh in the early 1980s on Vax 11/750s and 11/780s (with tiny memories and slow disks). It's 2023, and we don't use Vaxen (or 4.2 BSD) any more.
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