lets assume natasha harry and sarah arent made yet which you can check using id "their usernames" lets also assume adminuser isnt created yet if it isnt you can run grep adminuser /etc/group to check if they arent groupadd adminuser useradd -G adminuser natasha useradd -G adminuser Harry useradd -s /sbin/nologin sarah passwd natasha passwd Harry passwd sarah grep adminuser /etc/group to verify if the two users are in there

# groupadd Adminuser # for i in natasha Harry ; do useradd -G Adminuser $i ; echo "redhat" | passwd --stdin $i ; done # useradd -s /sbin/nologin sarah ; echo "redhat" | passwd --stdin sarah