On 2018-10-31, Stuart Henderson <s...@spacehopper.org> wrote:

> No idea how ^4 is mapped to ^\, but for some reason it is,

This goes back to the VT220, if not older terminals.  Ctrl-3 for
ESC aka ^[ is particularly handy if the Esc key is in some inconvenient
place as on most PC keyboards.

See "Table 3-5 Keys Used to Generate 7-Bit Control Characters" in
the VT220 Programmer Reference Manual:
https://vt100.net/docs/vt220-rm/table3-5.html

-- 
Christian "naddy" Weisgerber                          na...@mips.inka.de

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