Junio C Hamano <gits...@pobox.com> writes:

> ...  It does not make sense to allow where you are
> to affect behaviour of the command, i.e. in these two invocations of
> ls-files:
>
>       git ls-files -X /var/tmp/exclude -i
>         cd example && git ls-files -X /var/tmp/exclude -i
>
> if the same line in /var/tmp/exclude meant completely different
> things, it would be crazy.

To put it another way, think of --exclude-from as a way to specify a
replacement for .git/info/excludes, and --exclude-per-directory as a
way to specify a replacement for the in-tree .gitignore files.

Historically, we did not have the --exclude-standard option from the
beginning, and only after we gained experience with --exclude-from
and --exclude-per-directory in our scripts, the --exclude-standard
was added to codify the (then-) best-current-practice after the fact,
and we used --exclude-from for exactly that purpose before then.

cf. 8e7b07c8 (git-ls-files: add --exclude-standard, 2007-11-15)
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