Restarting modem/router through software

[Tim]

Paul Smith:
>> Thanks, Frank, but my problem is that I do not know the command to
>> check the IP address. What is it?

Frank Cox:
> http://www.myip.dk/

I was thinking of logging my system to see whether mine changed.  Does
anybody know of a service where you'd get a one-line response you could
make use of with a cron job running hourly?  That page returns too much
data.