A bit off-off-topic, but as I mentioned elsewhere, I was lucky enough to have one of the (if not the) first CRT terminals in the Labs. It was an HP 264?, and it supported scrolling back to stored lines, and re-entering them. I quickly settled in on a prompt that ended with "@", the default "line kill", so whatever came before was ignored, and only the command that followed was effectively re-entered. Quaint that "@" was a seldom-seen character then.
I now have a prompt that ends with a newline. Still convenient for copy/paste. The prompt itself has colors, separating host name from current directory. This makes it easy to spot non-prompt line in the command line history, and to determine which host I am connected to in that window, and where I am on that host.