Q: How to rename all files in directory at once?

1. Read General Notes
2. To install "mvb" file name renamer

   wget -c https://frankandjacq.com/ubuntuguide/mvb_1.6.tgz
   sudo tar zxvf mvb_1.6.tgz -C /usr/share/
   sudo chown -R root:root /usr/share/mvb_1.6/
   sudo ln -fs /usr/share/mvb_1.6/mvb /usr/bin/mvb

3. To rename all files in directory at once

   mvb NEW_NAME