保存vim打开的readonly文件
一，输入密码： :w ! sudo tee % > /dev/null [sudo] password for user:
二，这里按 L键重新将该文件载入缓冲区。 Press ENTER or type command to continue W12: Warning: File “/etc/profile” has changed and the buffer was changed in Vim as well See “:help W12” for more info. [O]K, (L)oad File:
