Batch – Replace Specific String in Text File

:: MrNetTek
:: eddiejackson.net/blog
:: 3/25/2020
:: free for public use 
:: free to claim as your own

@echo off
setlocal enabledelayedexpansion

:: variables
set Input=Text.tmp
set Output=Text.dat
set strOld=9F1AE7B34381DFD1111
set strNew=9F1AE7B34381DFD9999

:: prep temp file
move "%Output%" "%Input%"
if exist "%Output%" del /q "%Output%"

:: search
for /f "tokens=1* delims=[]" %%a in ('type "%Input%" ^| find.exe /n /v ""') do (
set strLine=%%b
:: replace
if defined strLine set strLine=!strLine:%strOld%=%strNew%!
echo.!strLine!
>>"%Output%" echo.!strLine!
)

:: cleanup
del /q %Input%
set %Output%=
set %Input%=
set %strOld%=
set %strNew%=

exit /b 0