Manually create user¶

sudo useradd user1 -s /bin/bash --create-home --home-dir /home/user1
sudo adduser user2 --shell /bin/bash --home /home/user2

Add user to group ==¶

sudo usermod -a -G groupname username

Remove user from group¶

sudo deluser username groupname
sudo groupadd -g 10000 groupname
sudo groupadd groupname