I have a set of numbered folders (001, 002, etc.) each of which contain a series of data files. These data files do not necessarily have unique names (ie. the same filename may be used for a different file in the 001 and 002 folders). What I'd like to do is run a batch for all folders (which could be placed into a master folder if needed) that accesses all files in the folders and renames them to include the folder name as a prefix. For example, the file 1Kl1 in folder 001 should be renamed 001_1Kl1 and the file 1Kl1 in folder 002 should be renamed 002_1Kl1. There are hundreds of folders so I'd like the batch to apply to all folders at once if possible.

what have you tried?

<B>:: prepend folder NUM NNN to files inside :: prefixn Wed 20-05-2009 14:05:55.60 @echo off & setLocal EnableDelayedExpansion pushd c:\files for /f "tokens=* delims= " %%a in ('dir/s/b/ad') do ( pushd %%a call :sub1 for /f "tokens=* delims= " %%i in ('dir/b/a-d') do ( echo ren %%i !FN!_%%i ) ) goto :eof :sub1 set FN=!CD! :loop for /f "tokens=1* delims=\" %%f in ("!FN!") do ( if "%%g" neq "" ( set FN=%%g goto :loop ) ) goto :eof ===================================== If at first you don't succeed, you're about average. M2