Permissions on /var/www/html for uploading web site files via SFTP
I've installed nginx successfully on an Ubuntu instance here at DigitalOcean. The index.html page (in /var/www/html) displays appropriately: "Welcome to nginx on Debian."
Now I want to upload some files via Cyberduck (sftp) to "duplicate" my current web site currently hosted elsewhere: chestradiologists.org
But I cannot because I don't have the appropriate permissions. (I created a new user with sudo permissions after I created the Ubuntu VPS.)
Via Cyberduck, I see the following for /var/www/html (all these directories):
Read Write Execute
Owner Y Y Y
Group Y No Y
Others Y No Y
I'm the only user that will upload files I create with Octopress on my Mac.
How do I change the ownership/permissions to best accomplish this ?
I have a rudimentary understanding of Unix permissions :-(
So, please explain with some detail if possible.