[Iska]

Код:

@echo off
setlocal enableextensions enabledelayedexpansion

for /f "usebackq delims=" %%i in (
	`findstr.exe /m /i /c:"start" "C:\Песочница\050\*.txt" 2^>nul`
) do move "%%~i" "C:\Песочница\051\"

endlocal
exit /b 0