Linux User Default Groups

My specialty is calling usermod with wrong params and clear all previous groups. Here are default ones in openSuse (except docker and sudo).

$ groups
users disk lp wheel floppy dialout audio video cdrom games input plugdev power netdev scanner docker sudo

there are less groups in the latest setup:

$ groups ivan
ivan : users lp wheel audio cdrom dialout disk input video docker

anyways to add all secondary groups again:

$ usermod -aG users,disk,lp,wheel,dialout,audio,video,cdrom,input,docker,sudo ivan

do not use -g, it modifies primary group. You might need to restart the system to see changes everywhere.