usermod -a -G wheel cyrus
cyrus is in group cyrus, to add cyrus to another group use the -a option. If you only use -G option only, cyrus will transfer group from cyrus to wheel.
Linux: Add existing user to a group
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usermod -a -G wheel cyrus
cyrus is in group cyrus, to add cyrus to another group use the -a option. If you only use -G option only, cyrus will transfer group from cyrus to wheel.
cyruslab 