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  1. or download this
    my $hostfile = '/tmp/jn/hosts';
open my $hostFH, '<', $hostfile
   or die "open: < $hostfile: $!\n";
  2. or download this
    $ perl -le '
> @IPs = qw{ 22.32.87.12 56.67.38.61 101.12.34.54 };
...
22.32.87.12
56.67.38.61
$
  3. or download this
    use strict;
use warnings;
...
10.23.212.6    hostc
192.168.100.254    fw1
192.168.1.21    hostbdup
  4. or download this
    10.23.212.6
10.31.17.65
192.168.1.21
192.168.1.78
192.168.100.254