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  1. or download this
    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.
  2. or download this
    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:\>