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I know I can move the cursor with the escape codes, and I can also print at the cursor. What I'd like to know is if it is possible to pull the character under the cursor.

I tried searching for such a code, but failed. So I assume it is not possible, but I'd like to ask if there is some way I failed to find.

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    Your shell may be able to do something similar for characters on the current command line (while typing, but before execution); see, for example, the Readline library in man bash and Z-shell's line editor in man zshzle. I'm unaware of any thing that would interact with arbitrary positions in the terminal emulator window.
    – chepner
    May 23 '13 at 0:16
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This is not possible unless you modify your terminal emulator to make it possible; use curses library or equivalent.

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