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