tips
Create a new user who is a member of the same groups as the current user.
$ groups
users lp wheel dialout video audio render docker autologin
$ printf "%s\n" $(groups) | sort
audio
autologin
dialout
docker
lp
render
users
video
wheel
tr '\n' ',' translates the newlines into commas, converting the list of groups into a comma-separated string
sed 's/.$//' uses sed (stream editor) to remove the last character (which will be the trailing comma from the previous step)
$ printf "%s\n" $(groups) | sort | tr '\n' ',' | sed 's/.$//'
audio,autologin,dialout,docker,lp,render,video,wheel
$ my_groups=$(printf "%s\n" $(groups) | sort | tr '\n' ',' | sed 's/.$//')
$ sudo useradd \
--comment "Hullo" \
--gid sudo \
--groups $my_groups \
--create-home \
--no-user-group \
newuser
# using short options
$ sudo useradd -g users -G $groups -m -N newuser