Emacs DIRED multi-file permissions

How to "chmod" multiple items at once

Raw link: https://www.youtube.com/watch?v=pQWa43YvQ2A

In this video I show how to use the built-in file manager of Emacs (dired == directory editor) to change file permissions for multiple items. This is yet another clear case where dired proves its utility.

Given the topic of this video, I also offer a primer on file permissions in Linux (I do not know how it works on other operating systems).

Though not related to this demo, here is the link to my dotemacs.