How can I save a file I opened in vim as the wrong user?
Just simply type your command with sudo like sudo vi filename.txt.
Then, hit i, edit what you want to change and hit Esc.
Then :wq
E45: 'readonly' option is set (add ! to override)
press Esc, then type :qa! and press Enter
Try the below command
:w !sudo tee %
Explanation
- :w – write
- !sudo – call shell sudo command
- tee – the output of write (:w) command is redirected using tee
- % – current file name
More info