in reply to How to access contents of a reference to a hash.
There is the easy way:
print $hashref->{hello};
That easy way is not enough if you need something like the "original hash" %hash:
print join "\n", sort keys %{$hashref};
Most likely, tyes References quick reference will be of help when you're dealing with references.
Update: As ambrus points out, I didn't read your code close enough - you are initializing the hash wrong. Assign a list to the hash, not a hash reference:
my %hash = ( hello => 'world', foo => 'bar', );
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