In Documentation/git-rev-parse.txt, there is this bit:
Check if <path> is a valid git-dir or a git-file pointing to
a valid git-dir. If <path> is a valid git-dir the resolved path to
git-dir will be printed.
I think the author invented the word "git-dir" to mean what we
ordinarily call $GIT_DIR (i.e. the directory that contains the
repository data), and used "git-file" to mean what the code and
error messages call "gitfile". I think it is better to leave these
in lowercase, but we would need them in the glossary, probably after
rewriting the latter to "gitfile". The former may want to be
rewritten to "gitdir" or even "$GIT_DIR".
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