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Aug 20, 2015 6:16 PM in response to j.clocheby Barney-15E,They aren't users. Staff is a group and it is the default group for all users.
Everyone is actually others and are those users who either do not own the file/folder or are in the same group as the file/folder.
Every item in a unix operating system normally has an Owner (user) and it is a member of at least one group. The POSIX permissions are read, write, and execute (rwx). If the user trying to access that item is neither the user or in the same group as the item, then the Other (everyone) permissions apply.
Hold down the option (alt) key when you click the + button. You'll get a very large list of users and groups which you can then select.
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