How to Add User to wheel group in CentOS 7 - e Learning (wsldp.com)
Add User to wheel group using usermod command
In usermod command -G option use to specify the group that user wants be added.(if -a options is not used user will be removed from other groups he is already a member of).
usermod -a -G wheel username
Example
usermod -a -G wheel jon
The above example will add the user jon to the CentOS 7 wheel group.
Add user to wheel group in CentOS 7 using gpasswd command
Command option -a use to add a user to group in gpasswd command.
gpasswd -a username wheel
Example
gpasswd -a admin wheel
Above Example will add user admin to the CentOS 7 wheel group.
Remove user from wheel group in CentOS 7
The gpasswd command also use to remove a user from the wheel group. To remove a user we use -d option.
Example
gpasswd -d admin wheel
Above Command will remove user admin from the wheel group.
