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#!/usr/bin/perl
 use strict;
...
 $heap->{'127.2'}{'127.1.0.2'} = 2;
 print "\$heap->{'127.2'}{'127.1.0.2'}: $heap->{'127.2'}{'127.1.0.2'}\
+n";
 print "\$heap->{127.2}{127.1.0.2}: $heap->{127.2}{127.1.0.2}\n";

$heap->{'172.16'}: 1
$heap->{172.16}: 1
$heap->{'127.2'}{'127.1.0.2'}: 2
Use of uninitialized value in concatenation (.) or string at /home/lar
+ry/project/sysmonitor/test/testHash2.pl line 28.
$heap->{127.2}{127.1.0.2}: