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#!/usr/bin/perl

...
use strict;
use warnings;
use Socket qw( getaddrinfo getnameinfo );

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"getaddrinfo" is not exported by the Socket module
 "getnameinfo" is not exported by the Socket module
Can't continue after import errors at /home/neil/bin/ptr line 7.
BEGIN failed--compilation aborted at /home/neil/bin/ptr line 7.