useradd -m 300 -g 10 myuser
echo "myuser_password" | passwd --stdin myuser
cat /etc/group | grep mygroup
cat /etc/group | grep anothergroup
cat /etc/passwd | grep myuser
useradd -m 300 -g 10 myuser
echo "myuser_password" | passwd --stdin myuser
cat /etc/group | grep mygroup
cat /etc/group | grep anothergroup
cat /etc/passwd | grep myuser