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A comment on Vim's 25th anniversary and the release of Vim 8. Parent comment

Re:Vim's 25th anniversary and the release of Vim 8 by bryogenic on Thursday February 09, 2017 @02:02PM (#13609784)
Also worth noting: Ctrl+[ = ESC in ASCII, which is where the keyboard shortcut comes from.

https://garbagecollected.org/2017/01/31/four-column-ascii/

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Re:Vim's 25th anniversary and the release of Vim 8 by inlineint on Friday February 10, 2017 @03:56AM (#13614143)
And it is processed not by Vim itself, but by the terminal emulator that sends Esc character to Vim. So the shortcut Ctrl+[ was not invented by vi author, but is a consequence of using Esc to exit from the edit mode.
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