:: folder renaming script for automotive MP3 changers.
:: all folders will be renamed to the CDxx format
:: author: igoriando 

@echo off
setlocal ENABLEDELAYEDEXPANSION
set /P dir=enter drive or path: 
cd /d %dir%
dir /b 
echo ====================================================
echo CHECK THE FOLDERS LIST, ALL FOLDERS WILL BE RENAMED!
set /P ANSWER=Continue(Y/N)?
if /i {%ANSWER%}=={y} (goto :yes)
if /i {%ANSWER%}=={yes} (goto :yes)
echo Operation canceled
pause
exit /b 1

:yes
set i=0
:: first rename all folders temporary to avoid naming conflicts
for /f "tokens=*" %%a IN ('dir /b')  do (
    set /a i+=1
    ren "%%a" temp!i! 
)
set i=0
for /f "tokens=*" %%a IN ('dir /b')  do (
    set /a i+=1
    if !i! lss 10 (ren "%%a" CD0!i! ) else (ren "%%a" CD!i!)
)
dir /b
echo Operation completed
pause
exit /b 0