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if ($macs[1] =~ /(\S{17})\|(\S{17})/) {
                print "$macs[0] MAC1: $1\n";
...
                $mac2 =~ s/:/-/g;                             #line 65
                print "Converted Mac1: $mac1 Mac2: $mac2\n";  #line 66
            }

ESO13 MAC1: 00:60:16:5D:4D:B4
ESO13 MAC2: 00:60:16:5D:4D:B5
Use of uninitialized value $mac2 in substitution (s///) at ipcheck.pl 
+line 65, <STDIN> line 1.
Use of uninitialized value $mac2 in concatenation (.) or string at ipc
+heck.pl line 66, <STDIN>
Converted Mac1: 00-60-16-5D-4D-B4 Mac2: