Massren is a command line tool that can be used to rename multiple files using your own text editor. Multiple-rename tools are usually difficult to use from the command line since any regular expression needs to be escaped, and each tool uses its own syntax and flavor of regex. The advantage of massren is that you are using the text editor you use every day, and so can use all its features. The tool works by creating a file that contains the filenames of the target directory, and opening this file in the text editor. You can then modify the filenames there directly. Once done, save the text file and the files will be renamed. Lines that are not changed will simply be ignored.