Problem
1. How do you save your entire home directory structure, including the hidden files, in a separate file?
2. What is the file /dev/null used for?
3. The commands cat and wc, when used without arguments, don't seem to do anything. What does that indicate, and how do you return the shell prompt?
4. How do you create a filename containing just one space character? How can you "see" the space in the ls output?