configuration file:/etc/sudoers
use visudo command or sudoedit comment to edit the configuration file with root privileges
add red content in the configuration file
## Allow root to run any commands anywhere
root ALL=(ALL) ALL
wmmwang ALL=(ALL) NOPASSWD:ALL
it means add sudo privileges for user wmmwang, NOPASSWORD means this user doesn't need to input password when he uses sudo privileges
use visudo command or sudoedit comment to edit the configuration file with root privileges
add red content in the configuration file
## Allow root to run any commands anywhere
root ALL=(ALL) ALL
wmmwang ALL=(ALL) NOPASSWD:ALL
it means add sudo privileges for user wmmwang, NOPASSWORD means this user doesn't need to input password when he uses sudo privileges