[SOLVED]Whats the opposite of su -c 'gpasswd -a USER sudo' ?

[debian121212]

Ran accross the command

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su -c 'gpasswd -a USER sudo'

as per http://forums.debian.net/viewtopic.php?f=17&t=122335

How do I do the opposite of that command in terminal? Want to remove USER from sudo group in debian 10.

Cant use https://askubuntu.com/questions/335987/ ... g-the-user

because I cant use the sudo command.

SOLUTION
Snooping around and found

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su -c 'gpasswd -d USER sudo'

[phenest]

For future reference, try the man pages:

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man gpasswd