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 ...
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 ...
The ATT international passport daily plan works off your phone plan messaging and data, and if you have a few port days in a row you really can make this a good investment. Plus an extra phone on the plan is only $5. If we have to make a call while at sea it is $1.99 a minute from your cabin. We have found that you can say a lot in one minute- lol!
The ATT basic cruise package is really easy to go over on your data. The cruise plus package is $100, and gives you more data but again you can go over if not careful. We do get the onboard wi-fi as we also have to keep in touch with family- but end up using the international day plan when on an island for $12 for 24 hours. Second person is $5 a day if needed. If ports are back to back it ...