Two things relevant to hw #4:

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admin group:
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It is possible that you won't have an "admin" group on your machine -
as default groups are not standard. Here are three possible ways that
would all be acceptable for answering the questions that have to do
with the admin group (Task 2, #4 & 7) :

1. Use a group other than admin: Use the groups command to find out which
groups you belong to on your local Linux machine.  If there is more than one
group there, you can use one of the groups that is not your default group to
test your commands.  You can find out your default group by doing a "touch"
to create a file, then do ls -l to see the associated group - the group
listed is your default group, so you will want to use one of the other
groups you found with the groups command to do Task 2, #4 and 7.

2. Use ugrads_cs on attu: Log onto attu, make a directory for your hw4,
untar the hw4.tar.gz there, and use the ugrad_cs group.  Just be careful to
be in the correct directory before you start testing your commands on attu.

3. Add the admin group to your local VM:

First add the admin group using:

    sudo groupadd admin
Then add your user to that group using:

    sudo usermod -aG admin <username>
You might have to log off and log back on for the new group to take affect.
I don't suggest this option if you are working in the lab or if you feel
uncomfortable modifying your own Linux machine's users and accounts.  This
option requires you to know the root password.

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sudo
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Also, note that you may or may not have sudo on the system you are
using, in which case it is fine to use su root instead.  Just remember that
you need to give a single bash statement to answer each question.

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Let me know if you have questions!

Ruth