CentOS How to assign rights to www root folder?

Question

linux

Good afternoon.
Means:
I have x, y (users) and there is a dev group. There is a folder in the www root (created it via root) and in the www folder there are two more folders xxx, yyy.
The dev group must have full rights to the www folder, including rights to xxx and yyy. User x must have access to xxx and user y must have access to yyy.
Such is my task. I created users, I created a group, but I don’t know how to assign rights.
I tried this:
chmod dev+rw www/
chmod dev+rw -R www/
chmod -R dev+rwx www/
And everywhere the error is "chmod: invalid mode".
How to be?

Answer 1

chmod -R 775 and further by analogy.

Answer 2

Нельзя писать сразу rw или rwx и нет никаких dev, нужно так u+w,g+w. Вам нужно установить владельцем папки xxx пользователя x, yyy - y, обоим папкам задать группу dev и задать права 775 (chmod 755 папка/), т.е. владелец и группа - полные права, остальные чтение и выполнение (770 если нужно только владелец и группа).

Answer 3

If you need to assign more than one owner or group to a folder - man setfacl/getfacl