One thing that came to me as news is that the command which—which is the de-facto tool to find the path of an executable—is not POSIX compliant. The recent Debian debacle1 around which brought it to my attention. The POSIX-compliant way of finding an executable program is command -v, which is usually built into most of the shells.

So, instead of doing this:

which python3.12

Do this:

command -v which python3.12

  1. Debian’s which hunt ↩︎

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