Solution for xxx is not in the soduers file under centos!

When sudo is used, the system prompts "xxx is not in the sudoers file. this incident will bereported. 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 following is the modification method:

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, enter the 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), save it (that is, Press Esc first, and then enter ": wq ") quit.
4) revoke the write permission of a file. That is, enter the command "chmod u-w/etc/sudoers ".

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