VarExists can be used to check whether a variable has been defined in the script during the previous execution steps or not.
Syntax:
VarExist(@variable_name)
Example:
/   Check whether the varilable exists   In this example the variable @notfound is not defined, therefore it will show the   message 'Variable not defined' during execution/
IF VarExists(@notfound)=FALSE THEN       PRINT 'Variable not defined!'ELSE    PRINT 'Variable @notfound is defined'END IF

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