@echo off
rem 设置源目录
set "ScDir=D:\test"
cd /d "%ScDir%"
for /f "delims=" %%a in ('type a.txt') do (
set "ct=%%a"
setlocal enableDelayedExpansion
ECHO !ct!|findstr /b /e "你好">>nul&&set "ct=!ct:你好=你好OK!"
ECHO !ct!
endlocal
)>>b.txt
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