[Batch] Log a message to a file and or the screen

Log.bat

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:Log <xLog> <xMessage> [xParrot] [xSession]
:: Append the message with a timestamp out to the specified log file and repeat
::  the message to the display if xParrot is set to 1.
if not "%~1"=="" if exist "%~1" echo.%Date% %Time% %~4: %~2 >> "%~1"
if /i "%~3"=="1" echo.%~2
goto :eof
:: by David Ruhmann