10.31.61.230,fall11,Thu 03/30/2011 15:20:46.70
10.31.61.212,spring96,Thu 03/30/2011 15:19:56.89
10.31.61.230,spring96,Thu 03/31/2011 15:40:46.70
10.31.61.230,winter11,Thu 03/31/2011 15:40:46.70

Because IP will change and hostname can be change too because it has different windows OS
How do i get new log with the latest info ? like latestip.txt
Now
10.31.61.230,fall11,Thu 03/30/2011 15:20:46.70
change hostname the next day so i have to keep new hostname and ip address
10.31.61.230,winter11,Thu 03/31/2011 15:40:46.70

If we have IP change from
10.31.61.212,spring96,Thu 03/30/2011 15:19:56.89
to
10.31.61.230,spring96,Thu 03/31/2011 15:40:46.70
then keep the new IP address and hostname
10.31.61.230,spring96,Thu 03/31/2011 15:40:46.70

so it will create new file and
this new log latestip.txt will be

10.31.61.230,winter11,Thu 03/31/2011 15:40:46.70
10.31.61.230,spring96,Thu 03/31/2011 15:40:46.70