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  1. or download this
    #! perl
use strict;
...
printf "3. \$hashref2 %s defined\n", (defined $hashref2 ? 'IS' : 'is N
+OT');
my $baz = $hashref2->{bar};
printf "4. \$hashref2 %s defined\n", (defined $hashref2 ? 'IS' : 'is N
+OT');
  2. or download this
     0:43 >perl 830_SoPW.pl

...
4. $hashref2 is NOT defined

 0:43 >