5) Syntax (case statement, for loops, user input)

https://tldp.org/LDP/Bash-Beginners-Guide/html/sect%5F07%5F03.html

• case statements

https://www.thegeekstuff.com/2011/07/bash-for-loop-examples/

• some VERY USEFUL bash for loops. Some VERY SIMPLE ones.

https://askubuntu.com/questions/446156/pause-execution-and-wait-for-user-input

• wait for user input