5.29.7 IS

The IS command is used to check if the return parameter is a NULL reference.

If the condition check is true, then an OK status is returned, else a status of NO is returned.

Syntax:

Command	Keyword	Value	Developer notes
IS	NULL	*RETURN	Conditional.
	NOT_NULL	*RETURN	Conditional.

 

Example

IS NULL(*RETURN)

 

IS NOT_NULL(*RETURN)