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efaq: Overwrite mode

 
 5.23 How do I make Emacs “typeover” or “overwrite” instead of inserting?
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 ‘M-x overwrite-mode’ (a minor mode).  This toggles ‘overwrite-mode’ on
 and off, so exiting from ‘overwrite-mode’ is as easy as another ‘M-x
 overwrite-mode’.
 
    On some systems, <Insert> toggles ‘overwrite-mode’ on and off.
 

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