add user to centos code example

Example 1: create user centos 7 command line

sudo adduser username

Example 2: add user with sudoer centos

echo "username  ALL=(ALL) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/username

Example 3: add user with sudoer centos

username ALL=(ALL) NOPASSWD:/usr/bin/du,/usr/bin/ping