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    Also, in many terminals Ctrl and numbers can be used to replace Ctrl with some punctuation:

    • ^2 is the same as ^@
    • ^3 is the same as ^[ (aka Esc)
    • ^4 is the same as ^\
    • ^5 is the same as ^]
    • ^6 is the same as ^^
    • ^7 is the same as ^_

    Some of these kind of make sense when you squint at an ASCII table.

    Edit: it seems that these go at least back to VT220 terminals except that ^6 and ^7 are different. I arrived at the list above by trying the keys out on iTerm2, but I’m sure I’ve used at least ^3 for Esc on several different computers.

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      We ran into an opposite problem with fish-shell: out-of-the-box, we used to set the terminal mode ourselves to allow ctrl+s to reach the shell and then ran into a subset of users who complained it broke flow control for them (because they were actually using the default ctrl+s xon/xoff behavior). We ended up detecting when the user explicitly re-enabled control flow (stty ixon) and flagging it internally to ensure that we didn’t override their preference.

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        In zsh you can also use setopt no_flow_control to disable ^S and ^Q. The difference with stty is that it only applies to ZLE (the zsh line editor) rather than everything, which may be better or worse, depending on what you want.