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Unary "-" performs arithmetic negation if the operand is numeric.  If 
+the operand is an identifier, a string con-
sisting of a minus sign concatenated with the identifier is returned. 
+ Otherwise, if the string starts with a plus
or minus, a string starting with the opposite sign is returned.  One e
+ffect of these rules is that "-bareword" is
equivalent to "-bareword".

If you don't want it to test the right operand
till the next evaluation, as in sed, just use three dots ("...") inste
+ad of two.  In all other regards, "..."
behaves just like ".." does.