How to create Users and them to Groups in Linux

Users are created with useradd and classified into their groups: [centos@iks-aufgabe ~]$ sudo useradd -G technical,Project Christine [centos@iks-aufgabe ~]$ sudo useradd -G Project Albert cut -d: -f1 /etc/passwd | xargs groups | tail -2 We check if the users have been created correctly by opening and filtering the passwd file with the following command: [centos@iks-aufgabe ~]$ cut -d: -f1 /etc/passwd ...