2023 Boost - Week 21

• Where can I read about loops and math in shell and bash?
• How do I repeat something one or more times?
• How can a counter be added to my loops?
• How do POSIX shell and bash shell differ regarding for loops?
• What is variable "scope"?
• What do "declare" and "local" mean? How are they different?
• How can we use a function to refactor our code to read more easily?
• What are the key differences betwen for and while loops?
• How are math operators and values different in shell from other languages?