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D:\>perl -wle"print undef" Use of uninitialized value in print at -e line 1. D:\>perl -wle"warn undef" Use of uninitialized value in warn at -e line 1.
D:\>perl -we"print 1 <=> undef Use of uninitialized value in numeric comparison (<=>) at -e line 1. ... Use of uninitialized value in subtraction (-) at -e line 1. 1 D:\>
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