Shell script Tutorial Series - User Defined Variables Interesting Behavior - Part4

Shell script Tutorial Series - User Defined Variables Interesting Behavior - Part4
This part covers
1. Interesting behavior of variables when variable's value has spaces in between
2. How shell behaves when shell has undefined variable
3. How to configure shell script to throw error in case there is any undefined variable
3. few mistakes which most of the programmers beginners

Shell Script Tutorial Series