Observer,
C:\>type renamejpg.bat
@echo off
Rem run this batch file with 3 command line variables
REM renamejpg.bat c:\new jpg 2009.January
REM renamejpg.bat destination extension Portion of file name
setlocal
REM Copy *.%2 %1
Rem Must be in the directory where files are originally
cd %1
for /f "tokens=*" %%a in ('dir /b *.%2') do ren "%%a" "%3.%%a"
C:\>renamejpg.bat c:\new jpg 2009.January
C:\>cd new
C:\new>dir *.jpg
Volume Serial Number is B8F2-4B99
Directory of C:\new
09/24/2008 09:07 PM 22,033 2009.January.piper.jpg
08/04/2004 07:00 AM 57,925 2009.January.Purple flower.jpg
08/04/2004 07:00 AM 44,190 2009.January.Radiance.jpg
08/04/2004 07:00 AM 81,433 2009.January.Red moon desert.jpg
12/03/2008 07:07 PM 58,551 2009.January.redflower.jpg
05/08/2008 07:47 PM 63,784 2009.January.Slide2.jpg
05/08/2008 07:48 PM 41,097 2009.January.Slide4.jpg
05/09/2008 07:10 AM 42,105 2009.January.Slide6.jpg
05/09/2008 07:11 AM 51,122 2009.January.Slide8.jpg
05/09/2008 07:12 AM 55,696 2009.January.Slide9.jpg
08/04/2004 07:00 AM 73,159 2009.January.Tulips.jpg
08/04/2004 07:00 AM 37,246 2009.January.Wind.jpg
08/22/2008 10:17 AM 8,165 2009.January.wolf3.jpg
31 File(s) 2,169,842 bytes
C:\new>