Can someone please help me?

Hi, I have to answer to some questions and i have just 2 hour to do it starting now..please someone help me.
this are the questions:

1. Describe the meaning of the '.' and '..' directories. Why are they needed?
2.What is a relative path? What is an absolute path?
3.Explain how to use the special characters '*' and '?' within the context of
the shell (how can you use them in an ls command? how can you use them
in a cp command?)
4.What is the meaning of "&" within the shell ? What can you do if you forgot
to use it?
5.Given a name of a file, how can you verify what are its permissions? What
is the meaning of permissions? (hint: use the man)
6.Explain how to use the file backup system (snapshot).
7.Finally, use the 'man' command to find out what do the following commands
do: 'grep', 'cat', and 'cal'. Give a simple example that will demonstrate you
know how to use these commands.

thank you so much

[jminatel]

These sound like homework questions. As much as we'd like to help, you're probably more likely to find more help in forums elsewhere that cater to many students than to professional programmers solving real coding questions.

Good luck in your studies.