The read-only result is in $r after the following snippet executes: 

my $r = $my_hash_ref;
$r = $r->{$_} foreach @k;

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The read-write result is in $$p after the following snippet executes: 

my $p = \$my_hash_ref;
$p = \($$p->{$_}) foreach @k;

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In reply to Re: I have a hash in a hash in a ..... by ikegami
in thread I have a hash in a hash in a ..... by Anonymous Monk

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