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If you get a warning from Perl that you don't understand then it's always worth checking the full description in perldiag. In this case, it says:

Using a hash as a reference is deprecated
(D deprecated) You tried to use a hash as a reference, as in %foo->{"bar"} or %$ref->{"hello"} . Versions of perl <= 5.6.1 used to allow this syntax, but shouldn't have. It is now deprecated, and will be removed in a future version.

I assume that the fact it used to work has something to do with the internal representation of hashes (and also arrays) as something similar works in C.

But as the warning says, this usage is deprecated. And if something is deprecated, you shouldn't use it.

p.s. It's a "question", not a "doubt".

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In reply to Re: hash reference doubt by davorg
in thread hash reference question by targetsmart

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    [Discipulus]: there is also find2perl with your perl installation
    [Discipulus]: and in the wanted sub you just calculate the duretion and add it the total, stop
    [shmem]: sub wanted { push @files, $File::Find::name if $File::Find::name =~/\.mp3$/ }
    [Lady_Aleena]: shmem, that is understandable! The two examples in File::Find don't make sense to me on a quick glance.
    [marioroy]: LA if the find worked from Unix command line, or does it not. Likely a quoting issue inside Perl qx.
    [Lady_Aleena]: marioroy, the find worked fine at the command line.

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