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:substitute OldStr NewStr File [OutFile] -- substitutes a string in a text file
::                                     -- OldStr [in]  - string to be replaced
::                                     -- NewStr [in]  - string to replace with
::                                     -- File   [in]  - input file to be parsed
::                                     -- OutFile [in] - (optional) output file for modified content
:$created 20060101 :$changed 20101122 :$changed 20240726 :$categories FileManipulation
:$source https://www.dostips.com
SETLOCAL ENABLEDELAYEDEXPANSION
SET "outputFile=%~4"
IF "%outputFile%"=="" SET "outputFile=%~3"
SET "tempFile=%TEMP%\tempFile.txt"
(
    FOR /F "tokens=1,* delims=]" %%A IN ('"type %~3 | find /n /v """') DO (
        SET "line=%%B"
        IF DEFINED line (
            SET "line=!line:%~1=%~2!"
            ECHO(!line!
        ) ELSE (
            ECHO.
        )
    )
) > "%tempFile%"
MOVE /Y "%tempFile%" "%outputFile%"
ENDLOCAL
EXIT /B