add www-data to group

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http://serverfault.com – I have a directory with the following details: drwxrwxr-x 6 root devs 4.0K Sep 9 14:57 project_dev Now I want www-data (Apache daemon) to have an access to this directory, so in my mind I am planning to add www-data to group devs. However I fear that I would cause wreckage if I execute this: usermod -a -G devs www-data Inputs please. (HowTos)