Thanks very much stevieb and tangent.

You guys made my day. I now understand the usage of variables and the place it should be defined. I did tried using subroutines but I believe my script requirement would be fulfilled more by the second method.

Till now the script does works as expected with one loop hole as I see.

After picking up unique values the output contains empty lines as below

If vlannum exists 
vnwlist: $VAR1 = [
          '192.168.165.0/255.255.255.0
'
        ];
vnwlist: $VAR1 = [];
vnwlist: $VAR1 = [];
vnwlist: $VAR1 = [];
vnwlist: $VAR1 = [];
vnwlist: $VAR1 = [];
vnwlist: $VAR1 = [];
vnwlist: $VAR1 = [];

[download]
if corelannum exists 
brnwlist: $VAR1 = [
          '192.169.73.0/255.255.255.0
'
        ];
brnwlist: $VAR1 = [];
brnwlist: $VAR1 = [];
brnwlist: $VAR1 = [];
brnwlist: $VAR1 = [];
brnwlist: $VAR1 = [];

[download]
I tried various provided here http://www.perlmonks.org/?node_id=124970

but nothing seems to work in my case. At one point I have to dump these values in a file and with these empty lines it will not be proper.

Also can someone please help me understand why do we use Data:Dumper ?

my script 
        for my $n (1..$num){
        $corebrip = $server->{'CoreLanIP_'.$n.'__1'} ;
        if (not $corebrip) {
            print "CoreLanNum $n - No value for CoreLanIP_".$n."__1\n"
+;
        next;
        }
#       print "CoreLanNum $n - brip: $brip, corebrip: $corebrip\n";
        $brmask  = $server->{'CoreLanNetmask_'.$n} . "\n" ;
        if ( $corebrip eq $brip ){
        $brlist = join ("/", $brip, $brmask) ;
        $brlist =~  s/.[0-9]*\//.0\//g;
        push( @brnwlist, $brlist) unless $seen{$brlist}++;
        }
        else {
#       print "coreip doesnot matches brip\n";
        }
    }
        print "brnwlist: ", Dumper(\@brnwlist);

        next if @brnwlist;
        my @vnwlist;
        my $vnum = $server->{CoreVlanNum};
        for my $i (1..$vnum){

        my $vlanip = $server->{'CoreVlan_IP_'.$i} ;
        if (not $vlanip) {
#       print "CoreVlanNum $i - No value for CoreVlan_IP_$i\n";
            next;
        }
#       print "CoreVlanNum $i - brip: $brip, vlanip: $vlanip\n";
        my $vmask  = $server->{'CoreVlan_Netmask_'.$i} . "\n";

        if ($vlanip eq $brip){
        my $vlist = join ("/", $brip, $vmask) ;
        $vlist =~  s/.[0-9]*\//.0\//g;
        push @vnwlist, $vlist unless $seen{$vlist}++;

        }
     }
         @vnwlist = grep (/\S/, @vnwlist);
         print "vnwlist: ", Dumper(\@vnwlist);
  }
}

[download]

In reply to Re^2: Use of uninitialized value $brip in join or string at script.pl line 50 by deep27ak
in thread Use of uninitialized value $brip in join or string at script.pl line 50 by deep27ak

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