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exist
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1995-02-18
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403b
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exist:
Synopsis: Check the existence of a variable
Syntax: exist ( VAR )
Description:
The exist function returns TRUE (1) if VAR exists, and FALSE
(0), if VAR does not exist. VAR is any valid variable name.
If you need to know if a variable exists, and if it is a
function or data, then use the exist function in conjunction
with the class or type functions.
See Also: class, type, who, what