In zsh (the default shell in MacOS), R launches the R programming language console.
r, in contrast, does ... what?
% which r
r: shell built-in command
% man r
No manual entry for r
I can't figure out how to do a web search for this one without getting results for R instead of r.
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Per man zshbuiltins, the builtin shell command r is equivalent to fc -e -, which, to my reading of the same manpage, selects the most recent command and executes it without editing.
