http://stackoverflow.com/questions/7787029/how-do-i-rename-all-files-to-lowercase - Open Terminal.app, type cd and then drag and drop the Folder containing the files to be renamed into the window. - To confirm you're in the correct directory, type ls and hit enter. - Paste this code and hit enter: <code> for f in *; do mv "$f" "`echo $f | tr "[:upper:]" "[:lower:]"`"; done </code>