Now, though, what about that sneaky Charlie, who wants to go snooping in other users' files?

[donnie@localhost /]$ su - charlie
Password:
Last login: Mon Nov 13 15:58:56 EST 2017 on pts/0

[charlie@localhost ~]$ cd /marketing

[charlie@localhost marketing]$ cat vicky_file.txt
cat: vicky_file.txt: Permission denied
[charlie@localhost marketing]$

So, yes, it's really true that only Cleopatra can access Vicky's file, and even then only for reading.