REN, a multiple file renaming utility with GUI

REN is a renaming utility with a GUI and several options. It was inspired by Quan's post on Blinkdagger where he had to rename hundreds of files: http://blinkdagger.com/matlab/matlab-batch-processing-a-group-of-files

Options include:
- Modes for adding prefix or suffix to filename, or changing file extension
- Can add custom text, or number series to the filenames
- Copy renamed files, or move them (deletes source file)
- Select multiple files using common filters, or sorted by attributes