If you use 
$hash{'key_one'} .= "my value 2";

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then you'll end up with $hash{'key_one'}=my valuemy value 2". If that's what you want, then that's great. If you want to have both values separate, you may need to use a hash of arrays (perldoc perlreftut for more information).

In reply to Re: Appending value to a hash value by Eimi Metamorphoumai
in thread Appending value to a hash value by Anonymous Monk

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