How to Make a User a Sudoer

1. Add user to wheel group:

   $ vim /etc/group
   - wheel:x:10:root,newuser
   

   or simple do this:

   $ gpasswd -a newuser wheel
   

2. Uncomment this line in sudoers file:

   $ vim /etc/sudoers
   - ## Allows people in group wheel to run all commands
   - %wheel    ALL=(ALL)    ALL
   

   or

   $ visudo