Add and Remove macOS User to Administrator Group Using Terminal
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List Users
dscl . list /Users | grep -v “^_”
Add User to Administrator Group
dscl . -append /groups/admin GroupMembership <username>
Confirm User was Added to Administrator Group
dscl . -read /groups/admin GroupMembership
Reboot
Remove User from Administrator Group
sudo dscl . -delete /Groups/admin GroupMembership <username>
Confirm User was Removed from Administrator Group
dscl . -read /groups/admin GroupMembership
Reboot