Chris Siebenmann@b0rk I ticked off 'the shell' in my set of answers because of technical knowledge: a shell with readline handling is handling Ctrl+C itself when you're editing a command line. Many shells/readline environments will react to Ctrl+C this way by 'interrupting' the command line you're editing and giving you a new top level prompt (which is handy if eg you're writing a multi-line 'for' or 'while' or etc and change your mind; you can Ctrl+C to throw the entire thing away).
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