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Please look at ascii table to see why ctrl-{key} sends a corresponding control code and why the modifier is called “control”: https://www.commfront.com/pages/ascii-chart

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The article explained it well enough. Makes sense, I just was unaware. From that chart though then could ^` generate a NULL byte?

The chart also lists the control key combination for each control byte, for NUL, it's C-@.

^` works too.

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