Let's change all the subdirectory assignments in /var/www/students/ so the owning group is the students group.
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Linux, at its root, does not have large single-purpose applications for one specific use a lot of the time.
Instead, there are hundreds of basic utilities that when combined offer great power to accomplish big tasks with efficiency.
Now you might wonder, what is wrong with always re-assigning permissions?
Imagine a large directory structure, for example /var/www/ on a production web-server.
If we re-assign the entire permission set, we take away all other custom permissions assigned to every sub-directory.