Add sudo permission for Linux Users

1) switch to the root user (SU ). 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 "VI/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 ".

Then you can.