How do groups work on Linux?

This is a really good article on how Linux groups work. The crux of it is that group and user information is attached to the process that is running (as a property to the process). Therefore unless you re-initialize your login, making changes to your group will not have an effect on process that are already running.

It’s a really good article and I recommend reading it: https://jvns.ca/blog/2017/11/20/groups/

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