How do I rename files in sub directories?

Question

Is there any way of batch renaming files in sub directories?

For example:

Rename *.html to *.htm in a folder which has directories

Answer 1

If you have forfiles (it comes with Windows XP and 2003 and newer stuff I think) you can run:

forfiles /S /M *.HTM /C "cmd /c ren @file *.HTML"