Hi,
     Let: Calculates the expression assigned to it and sets the expression result to the variable.
     Set: Assigns the value(or expression which is after the equal sign) as it is without compute.
Example:
     Set vVar=2+3; //vVar has the expression 2+3 as value we have to compute it using $(vVar) which returns 5
     Let vVar=2+3;//vVar has the computed value 5
Hope it helps
Celambarasan
 
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