" Open a current file with sudo
:e suda://%

" Save a current file with sudo
:w suda://%

" Edit /etc/sudoers
:e suda:///etc/sudoers

" Read /etc/sudoers (insert content under the cursor)
:r suda:///etc/sudoers

" Read /etc/sudoers at the end
:$r suda:///etc/sudoers

" Write contents to /etc/profile
:w suda:///etc/profile

" Save contents to /etc/profile
:saveas suda:///etc/profile