[Help-bash] Substitute bash code into a curl command

[Csányi Pál]

Hi,

I want to set a cron job with the following command:
curl http://[USERNAME]:address@hidden/update?hostname=[DOMAIN]&myip=[IP]

So the command could be eg.
curl -v 
http://username-gmail-com:address@hidden/update?hostname=somename.ipdns.hu&myip=95.85.***.***

My question is: can one use this command as a cron job to execute
every say 10 minutes but so so the current IP address of the eth0
network interface ( this is the WAN interface ) - the [IP] in abowe
command - should be substituted automatically with the Current IP
address of the eth0 interface?

This is the way how can I update my dynamic IP address only.

-- 
Best, Pali