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Sometimes when I edit a file which require root permission (e.g. files under /etc), but I forget run vim as sudo.
After edit finished, and type :wq to save and leave, I find I can’t, even using !wq, because the file is readonly.
If I leave and re-edit the file, all my work will lost, but if not, I cannot save my edit. So, how can I gain root permission to write without leaving vim?
To force a save use the following command
It will prompt you for your password.