Bash – Move files from subfolder to current folder

dir /b /s /a-d will get you files only. I think for relative paths you're going to need to do some more work than just a simple batch file, e.g. call some vbscript to (1) get the current directory, (2) open the text file, (3) do a search and replace on the text file, and (4) save the result back.

find . -depth -print0 | xargs -0 rename -n '$_ = lc $_'

Take out the -n flag once you're sure that it's doing what you want.