[#] add root user
adduser -u 0 -o -g 0 -G 0,1,2,3,4,6,10 -M root1
[#] Explanation
adduser - Using Linux adduser command to create a new user account or to update default new user information.

-u 0 -o - Set the value of user id to 0.

-g 0 - Set the initial group number or name to 0

-G 0,1,2,3,4,6,10 - Set supplementary group to:
0 = root
1 = bin
2 = daemon
3 = sys
4 = adm
6 = disk
10 = wheel

-M - 'home directory' not created for the user.

root2 - User name of the new user account

[#] set password for root user
passwd Root2
