xpr substr $stringZ 4 3` # ABC
===== Default =====
These operators can be used in a variety of ways. A good example would be to give a default value to a variable normally read from the comman... ariety of ways. A good example would be to give a default value to a variable normally read from the comman... ; otherwise return word.
Purpose:
Returning a default value if the variable is undefined.
Example:
