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A comment on How does `cd` work?. Parent comment

Re:How does `cd` work? by zokier on Thursday March 01, 2018 @03:08PM (#16495710)
> If /usr/bin is on a case-insensitive filesystem, and you execvp("CD", ...)

That seems like fairly rare edge case, considering that UNIX typically had case-sensitive file-systems, or rather handled filenames as opaque blobs. I wonder what actual system caused the need for case folding? Maybe HFS?

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Re:How does `cd` work? by LukeShu on Thursday March 01, 2018 @03:49PM (#16496173)
The `tr` bit isn't actually in the FreeBSD version of the script[1], so I'm assuming it's a macOS HFS thing.

https://github.com/freebsd/freebsd/blob/master/usr.bin/alias...

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Re:How does `cd` work? by kbob on Thursday March 01, 2018 @10:15PM (#16498693)
Mac filesystems case-fold by default, so the script could be invoked as cd, CD, Cd, or CD. Only the lowercase cd is shadowed by the builtin.
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