For this lab, you'll just put together everything that you've learned in this chapter to create a shared directory for a group. You can do this on either of your virtual machines:

1. On either virtual machine, create the sales group:

sudo groupadd sales

2. Create the users mimi, mrgray, and mommy, adding them to the sales group as you create the accounts.

On the CentOS VM, do the following:

sudo useradd -G sales mimi
sudo useradd -G sales mrgray
sudo useradd -G sales mommy

On the Ubuntu VM, do the following:

sudo useradd -m -d /home/mimi -s /bin/bash -G sales mimi
sudo useradd -m -d /home/mrgray -s /bin/bash -G sales mrgray
sudo useradd -m -d /home/mommy -s /bin/bash -G sales mommy

3. Assign each user a password.
4. Create the sales directory in the root level of the filesystem. Set proper ownership and permissions, including the SGID and sticky bits:

sudo mkdir /sales
sudo chown nobody:sales /sales
sudo chmod 3770 /sales
ls -ld /sales

5. Log in as Mimi, and have her create a file:

su - mimi
cd /sales
echo "This file belongs to Mimi." > mimi_file.txt
ls -l

6. Have Mimi set an ACL on her file, allowing only Mr. Gray to read it. Then, have Mimi log back out:

chmod 600 mimi_file.txt
setfacl -m u:mrgray:r mimi_file.txt
getfacl mimi_file.txt
ls -l
exit

7. Have Mr. Gray log in to see what he can do with Mimi's file. Then, have Mr. Gray create his own file and log back out:

su - mrgray
cd /sales
cat mimi_file.txt
echo "I want to add something to this file." >>
mimi_file.txt        
echo "Mr. Gray will now create his own file." >
mr_gray_file.txt        ls -l
exit

8. Mommy will now log in and try to wreak havoc by snooping in other users' files and by trying to delete them:

su - mommy
cat mimi_file.txt
cat mr_gray_file.txt
rm -f mimi_file.txt
rm -f mr_gray_file.txt
exit

9. End of lab.