So far I have found four different ways to add a user to the sudoers group and not all methods work in all systems.
Why so many different implementations?
What is the best?
What is the standard (i.e. work in most systems)?
XDG_RUNTIME_DIR is necessary for systemctl --user to work.
On a multi-user system, what protects against any user accessing any other users files via root? As context, the question is based on my understanding as follows:
Let’s say there’s a directory that I don’t have the privileges to access. Obviously sudo cd foo won’t work, because cd is a shell builtin in every shell ever.