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5

Perhaps your confusion arises from not having used an actual terminal. Back when serious computers were the size of several upright refrigerators, a terminal communicated with a central computer over a serial cable using characters and characters only. The characters were part of some standardized character set, e.g. ASCII or EBCDIC, but typically ASCII. ...


5

You can indent the region, to do this for the whole buffer: mark whole buffer with C-x h (or M-x mark-whole-buffer) run indent region with C-M-\ (or M-x indent-region)


2

Terminals transmit characters (more precisely: bytes), not keys. When you press a key or a keychord like Ctrl+;, this information has to be encoded into a sequence of bytes. Keychords that represent a character, like A or Shift+A or À, are sent as that character: a, A, à (the last one being one or two bytes depending on the terminal's character encoding). ...



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