eth0      Link encap:Ethernet  HWaddr 00:0C:29:0F:9B:82
          inet addr:192.168.8.76  Bcast:192.168.8.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe0f:9b82/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:280252 errors:0 dropped:0 overruns:0 frame:0
          TX packets:106184 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:35501675 (33.8 MiB)  TX bytes:11696548 (11.1 MiB)
          Base address:0x1080 Memory:f4820000-f4840000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4664 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4664 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:7952486 (7.5 MiB)  TX bytes:7952486 (7.5 MiB)

##</code><code>##

open FILE,"config.txt" or die "cannot open file : $!";
$i = 1;
while(<FILE>) {
	chomp ($_);
#	print "===$_"."\n";
	@arr=split /\s+/, $_;
	#print "line is =>$arr[]". "\n\n";
    print "Line $i ->$arr[0] $arr[1]"."\n";
	foreach $line (@arr) {
		#print "My Elements -> $line\n";
	    if ($line =~ (/^addr:(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/)){
	    $ipaddr ="$1.$2.$3.$4\n";
	    print "$ipaddr";
		}
	}
	$i++;

	# print $_;
}

##</code><code>##

Line 1 ->eth0 Link
Line 2 -> inet
192.168.8.76
Line 3 -> inet6
Line 4 -> UP
Line 5 -> RX
Line 6 -> TX
Line 7 -> collisions:0
Line 8 -> RX
Line 9 -> Base
Line 10 ->
Line 11 ->lo Link
Line 12 -> inet
127.0.0.1
Line 13 -> inet6
Line 14 -> UP
Line 15 -> RX
Line 16 -> TX
Line 17 -> collisions:0
Line 18 -> RX

##</code><code>##

eth0 => 192.168.8.76
lo => 127.0.0.1