@Echo Off
	Set "BoxIn=C:\Box_In"
	Set "Mask=*.txt"
	Set "KeyWord=Ступень"

	Pushd "%BoxIn%" && FOR /F "usebackq delims=" %%f IN (`2^>nul Dir "%Mask%" /B /A:-D`) DO (
		>"%%f.tmp" (FOR /F "usebackq delims=" %%t IN (`2^>nul More "%%f"^|FindStr /I /V "%KeyWord%"`) DO Echo %%t)
		>nul Move /Y "%%f.tmp" "%%f"
	)
	Popd
Exit /B