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#!usr/bin/perl

...

say $undump->{'testing'}->{'link'} // (die "'link' not found!");
say $undump->{'testing'}->{'bandwidth'} // (die "'bandwidth not found!
+");

#!usr/bin/perl

...

say $hash->{'testing'}->{'link'} // (die "'link' not found!");
say $hash->{'testing'}->{'bandwidth'} // (die "'bandwidth not found!")
+;