INDEX.BAT 
@echo off
cls
if "%1"=="" goto usage
if exist %1.txt goto mess
echo.      Please wait, listing files on CD drive to %1.txt.
echo.
dir /b /s f:\*.* > %1.txt
goto end
:mess
echo.
echo.        %1.txt already exists.
echo.        Please use another number,
echo.        or delete %1.txt first.
echo.
goto exit
:end
echo.
echo.       %1.txt created successfully.
echo.
goto exit
:usage
echo.
echo.  Usage: index 040 (where 040 is the cd label number)
echo.
goto exit
:exit
rem   END OF THIS BATCH FILE