Create the following users, groups, and group memberships:
A group named adminuser.
A user natasha who belongs to adminuser as a secondary group A user harry who also belongs to adminuser as a secondary group.
A user sarah who does not have access to an interactive shell on the system, and who is not a member of adminuser, natasha, harry, and sarah should all have the password of redhat.
A. See explanation below.
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groupadd adminuser
useradd natasha
usermod -Ga adminuser natasha
useradd harry
usermod -Ga adminuser harry
useradd sarah
usermod -s /sbin/nologin sarah
passwd natasha
passwd harry
passwd sarah
that will change natasha group and not add it as a secondary group
rather use
usermod -aG adminuser natasha
groupadd adminuser
useradd -G adminuser natasha
passwd natasha
rehat
redhat
useradd -G adminuser harry
passwd harry
redhat
redhat
useradd -s /sbin/nologin sarah