Windows Batch File Renumbering

BATCH_RENUMBER.bat

rem BATCH_RENUMBER.bat
rem v1
rem 8 July 2015
rem EAB @ NHF


@echo off
setlocal EnableDelayedExpansion
cls

rem Explaining how it works:

echo BATCH_RENUMBER.bat
echo 	This script renumbers uniform suffixed files
echo 	ie: MD01.dwg, MD02.dwg, ...
echo 	Here, "MD" is the PREFIX, and "01", "02" are the SUFFIX
echo 	".dwg" is the EXTENSION
echo 	Run this from the folder with the files you want to renumber


rem Priming with user input:

echo.
set /p PREFIX="PREFIX = "
set /p EXTENSION="EXTENSION = "


rem We prevent collisions by suffixing with .old

set OLD=".old"


echo Enter file numbers
echo.

rem Here's the prompt>rename loop

: loop

	rem Get the file numbers

	echo.
	set /p OLDNUM="	Current number = "
	set /p NEWNUM="	Change to = "


	rem Make the filenames
	set OLDFILE=%PREFIX%%OLDNUM%%EXTENSION%
	set NEWFILE=%PREFIX%%NEWNUM%%EXTENSION%


	rem Prevent collisions/check if previous collision has been prevented and correct filenames

	rem Check the newfile and move it out of the way if necessary

	if exist %NEWFILE% (
		ren %NEWFILE% %NEWFILE%%OLD%
	)

	if exist %OLDFILE%%OLD% (
		ren %OLDFILE%%OLD% %NEWFILE%
		echo Sucess
	) else (
		echo %OLDFILE%
		if exist %OLDFILE% (
			ren %OLDFILE% %NEWFILE%
			echo Success
		) else (
			echo Original file not found, check prefix/extension/numbering
		)
	)

goto loop

echo Press any key to exit

pause

endlocal