Re: [RFC PATCH 3/4] submodule: cache superproject gitdir during absorbgitdirs

Emily Shaffer [off-list ref] writes:

+	test . -ef "$(git -C sub1 config submodule.superprojectGitDir)" &&

Unfortunately "test f1 -ef f2", "test f1 -nt f2", etc. are not part
of POSIX.

When in doubt, check

  https://pubs.opengroup.org/onlinepubs/9699919799/utilities/toc.html

Thanks.