How to rename file extension on multiple files in Trident Linux (Void Linux) in command line? [with screenshots]

Bulk rename is very simple and fast in Trident Linux, because we can use only terminal and rename tool (which is already installed by default in Trident as a part of util-unix package):

Let's check if rename tool is installed:

$ rename --version

Great, now we can use it.

I have several video files:

And my aim is to rename all extensions from .m4v to .mp4. Let's use rename bulk:

$ rename .m4v .mp4 *.m4v

Output: