Basic editing with EMACS.

doc/EMACS.md

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+## Basic editing with EMACS
+
+- ^X^F *file* CR - load file
+- ^X^S *file* CR - save file
+- ^X^C - exit (but don't kill emacs)
+- ^F - move cursor right (forward)
+- ^B - move cursor left (backward)
+- ^A - beginning of line
+- ^E - end of line
+- ^N - go to next line
+- ^P - go to previous line
+- ^D - delete character to the right
+- DEL - delete character to the left
+- ^K - delete to end of line