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https://en.wikipedia.org/wiki/Emacs
Multics Emacs is an example of early Emacs implementations Emacs (/ ˈiːmæks / ⓘ), originally named EMACS (an acronym for "Editor Macros"), [1][2][3] is a family of text editors that are characterized by their extensibility. [4] The manual for the most widely used variant, [5] GNU Emacs , describes it as "the extensible, customizable, self-documenting, real-time display editor". [6 ...