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by spudlyo 4717 days ago
Hitting '.' at a prompt used to be a common idiom for exiting a program. I first saw it when I was a kid working on an HP-3000 system where the system programming language was BASIC and all programs followed this convention. Don't know where it came from originally, but you can still see it in places like rsh/SSH etc.
1 comments

And SMTP where a single "." followed by CR ends the session.