Solutions to Lab 7
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4. 'ls' is one such command.
                                                                                
5. 'echo' is one such command.

12. cat "*"

13. The shell looks in the current directory for things 
(files/directories/links) that match the expression "CS2204*" and these
are passed as input to the egrep command. This is the difference between
a wildcard and a regular expression that is passed to egrep. This was
covered in detail in the Sep 19 class lecture (see lecture notes).

14. What is printed will be "Hello World" (i.e., without the quotes).
   The shell by default uses spaces to separate arguments and in this case,
   detects a single argument. It automatically 'cancels' the quotes for you
   so that the three logical arguments ("Hello ", "", and World) get packaged
   into one. You will get points if either you said one argument (without
   the quotes) or three arguments (with the above split-up).

15. echo A quote is \", a backslash is \\, backtick is \'.
    echo A few spaces are "   " and dollar is \$. \$MY_VAR is 5.