Options (4)
-A, --administratorsbooleanDefine group administrators
Example:
sudo gpasswd {{[-A|--administrators]}} {{user1,user2}} {{group}}-M, --membersbooleanSet the list of group members
Example:
sudo gpasswd {{[-M|--members]}} {{user1,user2}} {{group}}-a, --addbooleanAdd a user to the named group
Example:
gpasswd {{[-a|--add]}} {{user}} {{group}}-d, --deletebooleanRemove a user from the named group
Example:
gpasswd {{[-d|--delete]}} {{user}} {{group}}made by @shridhargupta | data from tldr-pages