Questions

1. What is parameter substitution?
2. How can we include default values for our defined variables?
3. How can we use parameter expansion to handle missing parameter values?
4. What does ${#*} do?
5. How does pattern substitution work when talking about parameter expansions?
6. How is pattern removal related to pattern substitution?
7. What types of case modifications can we perform?
8. Which two things can we use to get a substring from a variable's value?