用vi修改文件，保存文件时，提示“readonly option is set”的解决方法。
This is a vim issue, not a file permission issue. If you did not have read permission on the file, you'd see a "Permission denied" error.
Do you invoke vi/vim with the -R option? Are you calling view instead of vi or vim? Do you have set readonly in your .vimrc or in a file in ~/.vim/ftplugin?
In vim you can enter :set noreadonly to unset the readonly flag.
步骤：
1.按Esc键
2.输入 :set noreadonly
3.然后就能正常保存了，你可以输入 :wq 来保存文件了。