Sort::Key::Top does it: 
use Sort::Key::Top qw(rukeytop);
  # ru => means reverse order and sorting keys are unsigned integers

my @recent = rukeytop { $out_hash{$_}{EPOCH} } 10 => keys %out_hash;

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In reply to Re: How to print the 10 most recent (epoch) keys in a hash when epoch is not the key by salva
in thread How to print the 10 most recent (epoch) keys in a hash when epoch is not the key by kevyt

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