In agreement with bm. The domain (eg google.com) handles many services and the www kind of says which service it is using (www, mail, smpt, pop, ftp...). Of course, as www traffic is probably the most common kind, servers will most likely know what is expected, and act accordingly. Many servers are configured to redirect traffic from (eg) google.com to www.google.com. One reason for this is ...
Hostname is an attribute of a system stored locally on that system. "Computer name" is what Windows uses to refer to the hostname. A subdomain is a DNS concept. In DNS, domain names (domains for short) can be authoritative or non-authoritative - if they are non-authoritative, that means another server "handles" that domain. So in a domain such as www.mysite.invalid - one thing that could ...
Whether you’re concerned for yourself or someone you care about, it's important to know the most common warning signs of dementia so you can ensure an early diagnosis.
Although dementia symptoms can vary due to the underlying cause, some key symptoms are common early indicators of this condition. This article will take a closer look at 11 of the most common...
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Edit: to answer your original question, yes, any member of www-data can now read and execute /var/www (because the last bit of your permissions is 5 = read + exec). But because you haven't used the -R switch, that applies only to /var/www, and not to the files and sub-directories it contains. Now, whether they can write is another matter, and depends on the group of /var/www, which you haven't ...