@echo off&setlocal enabledelayedexpansion
set "s=aa"
set "d=haha"
(for /f "delims=" %%a in (1.txt) do (
set "str=%%a"
if not defined a (
if not "!str:%s%=!"=="%%a" (
set str=!str:%s%=%d%!
set a=.
)
)
echo,!str!
))>2.txt
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