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I have my ubuntu web server up and running and was wondering how you guys approach group permissions for folders and such? for example, I host a few of my own sites on my server and two sites for two of my friends. I want to have their user accounts restricted to their own respected folders, but I want my account that I use with my sites to be able to read, write and execute any of their files as well, so I can ssh or sftp into my box and do what I need to do under 1 login.

I've been told that this can get a little tricky because sometimes files don't have the appropriate permissions.

any suggestions/pointers?

Setting up servers is much easier when you are the only user.
The webserver/DB permissions could be the tricky part.
Since no one answered yet, you might want to try http://www.webhostingtalk.com


Edit:
Also http://serverfault.com has tons of info.
(but, FYI they do not like duplicate questions)