Add and Remove User to Administrator Group Using Terminal in Apple macOS

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LIST USERS

dscl . list /Users | grep -v “^_”

MAKE USER AN ADMINISTRATOR

dscl . -append /groups/admin GroupMembership <username>

dscl . -read /groups/admin GroupMembership (Verify Addition)

-OR-

REMOVE USER FROM ADMINISTRATORS

sudo dscl . -delete /Groups/admin GroupMembership <username>

dscl . -read /groups/admin GroupMembership (Verify Removal)

REBOOT