Where did . come from

[Hgntkwis]

Granted, you need something to signify that a file is a dir (remember,
in linux everything is a file), and what the parent dir is.
I'm assuming that the kernel folks decided the name, or at least have
some idea about it.
I'm not objecting, it's fine, I just want to know this history behind the
decision to use . instead of say $ or %.

Thanks, David

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