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#!/usr/bin/perl
use warnings;
...
store $hashref, $HASHFILE;

# END OF PROGRAM

me@ubuntu01$ rm file
me@ubuntu01$
...
Hash has key2!  (Value is: 'data2')
me@ubuntu01$
me@ubuntu01$

Use of uninitialized value in printf at ./SerHash2.perl line 33.
Hash has key2!  (Value is: '')