サーバを触ってて良く出てくるくせに毎回忘れるのでメモ
E45 readonly option is set(add ! to override)が出たら
入力モードをescで抜ける
コマンドモードで下記を実行
###:w !sudo tee %
その後に、強制脱出装置
###:q!
上書きできてる！
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