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Compares two character strings (by using the standard C function).Parameters
I strcmp ( S _a_ S _b_ )
Return value
_a_ any string _b_ any string
comparison result. 0 if equal, 1 if _a_ greater than _b_, -1 else
if _a_ and _b_ are nil, 0 is returned
if only _a_ is nil, -1 is returned
if only _b_ is nil, 1 is returned.