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Bat Script replaces the whole line in Config file  : Count Char :countChar     setlocal set x=%1 set n=0 set m=255 :loop if "!x:~%m%,1!" == "" ( set /a "m>>=1" goto loop ) else ( set /a n+=%m%+1 set x=!x:~%m%! set x=!x:~1! if not "!x!" == "" goto loop     ) set /a "rtn=%n" exit /b %rtn% call :countChar %usrname% echo the answer is %errorlevel% Replace string   GOTO:MAIN :firstMethodName     SETLOCAL ENABLEDELAYEDEXPANSION         SET seachString=%~1         SET replaceLine=%~2       set finalReplaceLine=%seachString% : %replaceLine% if exist %target% del %target% for /F "delims=" %%a in ('type %source%') do (  set line=%%a  echo %%a | find /i "%seachString%" && set line=%finalReplaceLine%  cls  echo !line! >> %target% ) del Config.txt rename "Output.txt" "Config.txt"     ENDLOCAL EXIT /B 0 ...