Let

The let statement is a complement to the set statement, used for defining script variables. The let statement, in opposition to the set statement, evaluates the expression on the right side of the ' =' at script run time before it is assigned to the variable.

Syntax:  

Let variablename=expression

Examples and results:

Example	Result
Set x=3+4; Let y=3+4; z=$(y)+1;	$(x) will be evaluated as ' 3+4 ' $(y) will be evaluated as ' 7 ' $(z) will be evaluated as ' 8 ' Note the difference between the Set and Let statements. The Set statement assigns the string '3+4' to the variable whereas the Let statement evaluates the string and assigns 7 to the variable.
Let T=now( );	$(T) will be given the value of the current time.