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Re:Ask HN: What are your favourite programming shortcuts by khrbtxyz on Saturday March 30, 2024 @03:46AM (#39872733)
Found it in the readline manual

https://tiswww.cwru.edu/php/chet/readline/readline.html#inde...

insert-comment (M-#) Without a numeric argument, the value of the comment-begin variable is inserted at the beginning of the current line.

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