If you don't want to use the command line to rename files the following application "pyrenamer" have a lot of functionality and work a charm.With pyRenamer you can change the name of several files at the same time easily.
→ You can use patterns to rename files.
→ You can use search & replace to rename files.
→ You can use common substitutions.
→ You can manually rename selected files.
→ You can rename images using their metadata.
→ You can rename music using its metadata.
To install it:
sudo apt-get install pyrenamer
