SHELL

add user to group

usermod -a -G examplegroup exampleusername

add user to group linux

sudo usermod -aG <groups> <username>

Adding users to groups

sudo usermod -a -G <groupname> <username>
e.g.
sudo usermod -a -G wonderland alice

command to add a user to a group

sudo usermod -a -G GROUP USER

linux add user to group

sudo groupadd $GROUP 
sudo usermod -aG $GROUP $USER

add user to group

usermod -a -G <group> <user>
$ usermod -a -G developer tom

create user with group

useradd -g <group> <user>
$ useradd -g developer tom

add user and group to folder

sudo chown -R www:ubuntu /opt/lampp/htdocs/