Managing Users in Linux

To add users to the system we can run

useradd <username>

So we would run

useradd tstark

useradd cdanvers

useradd dprince

To create a new group we would run

groupadd <groupname>

So for this task

groupadd superhero

For this task we would run usermod like this

usermod -g wheel tstark

There isn't an easy way to do this all at once, so we need to run the following command for each user

usermod -aG superhero <username>

So

usermod -aG superhero tstark

usermod -aG superhero dprince

usermod -aG superhero cdanvers

To lock an account all we have to do is run:

usermod -L dprince