Answer Posted / pitambar mishra

### Note : Function always returns a value.
### This script is for adding two numbers.
### Script name : add.ksh

#!/bin/ksh

sum() ### Defining sum function
{
echo enter 2 no :
read num1 num2
echo sum=$(( num1 + num2 ))
}
sum ### Invoking sum function

To execute it :
ksh add.ksh

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