Class 4: Array Manipulation in shell script
This class demonstrate
1. How to declare an array
2. How to print the first element of an array
3. How to print an element at any specific position in an array
4. How to print all the elements of an array
5. How to print a subset of elements of an array
5. How to get the size of an array
6. How to know the size of any specific element in an array
7. How to replace any character by another character in an array