perl script for logging external ip address and analysing changes from its logfile

externalIp.pl

@@ -0,0 +1,6 @@
+#!/usr/bin/perl
+
+($ip=`wget -q -O - http://checkip.dyndns.org`)=~s/\n$//;
+$ip=~s/.*[^\d](\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})[^\d].*/$1/;
+($date=`date`)=~s/\n$//;
+print "$date\n$ip\n";

ipchanges.pl

@@ -0,0 +1,21 @@
+#!/usr/bin/perl
+
+my $file = "/home/lookshe/myips.txt";
+
+open(FILE, $file) || die("unable to open $file!");
+my @lines = <FILE>;
+close(FILE);
+
+for ($i = 1; $i <= $#lines-2; $i+=2)
+{
+   my $ip = $lines[$i];
+   chomp($ip);
+   my $nextip = $lines[$i+2];
+   chomp($nextip);
+   if ($ip !~ m/^$nextip$/)
+   {
+      my $time = $lines[$i+1];
+      chomp($time);
+      print "$time: $ip -> $nextip\n";
+   }
+}