$ uname
Darwin
$ which cd
/usr/bin/cd $ uname
Darwin
$ which cd
/usr/bin/cdWhat you posted is not reproducable on Ventura (13.6)
% uname
Darwin
% which cd
cd: shell built-in command(zsh has which as a built in command, apparently bash doesn't, which causes the different output). It's unclear to me what /usr/bin/cd actually accomplishes though, even in bash.
(final edit I hope, I found an explanation of sorts for /usr/bin/cd: https://unix.stackexchange.com/a/50060)
Seems to be something they adopted from FreeBSD if the comment in the script is anything to go by ? (`/usr/bin/cd` is a shell script, you can cat it).
It seems something to do with it being a POSIX system if this SO answer[1] is anything to go by.
Beyond my paygrade though, and given Apple's shell appears to default to the built-in it seems I don't need to care either. :-)
[1] https://unix.stackexchange.com/questions/50022/why-cant-i-re...
ls /usr/bin/cd