I always feel that graphical interfaces make easy things difficult, in most cases. A bunch of figity clicking around, instead of a few keystrokes I could press with my eyes closed. They are more discoverable, though.

If you use emacs, dired and wdired together are fantastic for managing files like that. You can even run dired over tramp, so you can manage files on a remote server that doesn't have emacs installed, using the emacs on your desktop. But there are also good cli options, you might want to look at the rename command, as one that's probably installed by default on any given distro. That's outside my expertise, though, as I just use emacs.