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Cmd-a is select all in OSX by default and Cmd-e does nothing for me. The capital versions don't do anything noteworthy for me either. In emacs, home/end would be M-< and M-> no? To your point, Ctrl-a/e/f/b/n/p all work as they do in emacs in OSX.

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They meant ctrl-a and ctrl-e.

CMD-e used to be "eject selected disk" in Finder/desktop. Will thus also cause the error-"bloing"/"don't know what you want"- sound on most macOS versions, if nothing suitable is selected.

CMD-e is apply the selected text to the search input. Extremely useful, search for the next instance of a word you see on the screen is thus:

Double click word CMD-e CMD-g

Don't know what (which program) you are referring to, I was referring to official MacOS shortcuts and the Finder [1] (Search for "Command-E")

[1] https://support.apple.com/en-us/HT201236

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