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
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