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Below script will insert a char at position:

#!/usr/bin/env emacs --script

(defun modify(filename)
  (find-file-literally filename)
  (goto-char 3)
  (insert "\x39")
  (save-buffer 0)
  (kill-buffer))

(modify "a.txt")

How can I modify it to replace a char at positon? for example:

a.txt content is:

abcdefg

Output changed to:

ab9defg

Current script output is ab9cdefg.

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2
  • 2
    Have you tried using (delete-char 1) before inserting?
    – user12563
    May 19, 2019 at 18:52
  • insert accepts chars as well as strings. You might find it clearer to write (insert ?9) or (insert "9") than to write (insert "\x39").
    – Drew
    May 19, 2019 at 20:00

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