Solution to saving the read-only document edited by vi

Solution to saving the read-only document edited by vi
Use a common user to edit configuration files such as nginx. conf:

When saving the file, the system prompts: No Root Permission.
You can solve this problem by using the following methods:
Add:
: W! Sudo tee %


I have a problem here. The sudo permission is not configured.
When sudo is used, the system prompts "xxx is not in the sudoers file. this incident will be reported. XXX is your user name, that is, your user name does not have permission to use sudo. You just need to modify the/etc/sudoers file. The modified method is as follows:
1) enter the superuser mode. That is, enter "su-". The system will ask you to enter the superuser password and enter the password to enter the superuser mode. (Of course, you can also use root)
2) Add the write permission for the file. That is, the input command "chmod u + w/etc/sudoers ".
3) edit the/etc/sudoers file. That is, enter the command "vim/etc/sudoers", enter "I" to enter the editing mode, and find this line: "root ALL = (ALL) ALL "add" xxx ALL = (ALL) ALL "(here xxx is your user name), and save it (that is, press the Esc key first, and then enter ": wq ") quit.
4) revoke the write permission of a file. That is, enter the command "chmod u-w/etc/sudoers ".
Save again:


Check whether it is successful:
$ Grep sudo nginx. conf
# Test: w! Sudo tee %