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The “kill” meaning of Ctrl+C is very old, I think even older than Unix. Wikipedia traces it back to TOPS-10, which would date it from the late 1960s. The article explains why Ctrl+C was a reasonable choice: in ASCII, which was published in 1963, the corresponding character is ETX, end-of-text. Lacking a character meaning “stop”¹, a character meaning “this ...

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