Dr.  Beyon has created a Question and Answer list for standard problems associated with labs.

This will explain how to move around in unix directories.  Unfortunately the directory structures have been changed since the document was created, so you will not be able to actually do the activity.  You can read it as though the directories do exist in that form and still get the idea.

A tutorial on the use of permissions in unix directories.  This tutorial was created by a group of students from CPSC 446.