1: sudo permissions:
root grants ordinary users to execute commands that could only be executed by super users
sudo operates on system commands
2: Use sudo
visudo actually modified the / etc / sudoers file
root ALL= （ALL） ALL
User name Managed host address = (available identity) is not the source IP address Authorization command (absolute path)
It means that yanglinux can only execute the / sbin / shutdown -r now command, other parameter options are not available.
% Indicates the group name The address of the managed host = (available identity) Authorization management (absolute path)
3: Ordinary users execute commands given by sudo
su-common username
sudo -l view available sudo commands
sudo absolute path
sudo / sbin / shutdown -r now (Ordinary users execute commands given by sudo)
Then prompt to enter the common user password:
