useradd -G admin user2 useradd -G admin user3 echo “redhat” | passwd --stdin user2 echo “redhat” | passwd --stdin user3

Make steps simple, more complex commands are confusing, [root@station ~]# cat /etc/group | grep -i admin [root@station ~]# [root@station ~]# groupadd admin [root@station ~]# [root@station ~]# useradd user2 [root@station ~]# passwd user2 [root@station ~]# useradd user3 [root@station ~]# passwd user3 [root@station ~]# [root@station ~]# [root@station ~]# id user2 uid=1004(user2) gid=1007(user2) groups=1007(user2) [root@station ~]# id user3 uid=1005(user3) gid=1008(user3) groups=1008(user3) [root@station ~]# [root@station ~]# usermod -a -G admin user2 [root@station ~]# usermod -a -G admin user3 [root@station ~]# [root@station ~]# id user3 uid=1005(user3) gid=1008(user3) groups=1008(user3),1006(admin) [root@station ~]# id user2 uid=1004(user2) gid=1007(user2) groups=1007(user2),1006(admin) [root@station ~]#

[root@abc ~]# passwd user2 --stdin Changing password for user user2. redhat passwd: all authentication tokens updated successfully. [root@abc ~]#

useradd user2 -G admin id user2 this syntax is vaild

for i in 2 3; do useradd -G admin user$i; echo "redhat"|passwd --stdin user$i; done

usermod -aG admin Using just G makes it the default group