Thanks for this sample, but it exceeds my script coding ability.
I added some comments to your sample but I may be lost.

#!/bin/sh

updater_prog = /usr/local/bin/noip2        # program to run
if [ x$reason = xREBOOT ]   ||  \      #  is this an reboot or
   [ x$old_ip_address = x ] ||  \      #  old ip field empty or
   [ x$old_ip_address != x$new_ip_address ]; then   #  old not EQ
new  then
    if [ -x $updater_prog ]; then                # don't know what
this does
        ${updater_prog} -i "$new_ip_address"    # exec program
    fi
fi

For my purposes I think this is what I need.
This way zoneedit is only updated when ip changes.
Do I have script correct?

/etc/dhclient-exit-hooks.sh    with this content
#!/bin/sh
# This script only gets called when dhclient runs
# (IE: boot and lease expire)
# Old and new ip  address fields are populated by dhclient,
# which keeps the old used IP address in some config file
# so it's not lost on reboot and can be read in at boot time to
# determine if the ip has changed. So with cable or dsl modem
# that stays powered on while PC is powered off still is
# using old IP address.

updater_prog = /usr/local/bin/wget....rest of command   # my wget
pgm

if [ x$old_ip_address != x$new_ip_address ];   # old not EQ new
        then ${updater_prog}                     # exec my pgm
fi


-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Lowell
Gilbert
Sent: Friday, February 13, 2004 2:24 PM
To: [EMAIL PROTECTED]
Cc: Ceri Davies; [EMAIL PROTECTED] ORG
Subject: Re: Using dhclient to update zoneedit with my dynamic IP
address

"JJB" <[EMAIL PROTECTED]> writes:

> Thanks for the pointer to the 'man dhclient-script'.
>
> I read through it 3-5 times and the best I can make out of what
> it says is, that if I create an file like this
> /etc/dhclient-exit-hooks.sh with this content
>
> #! /bin/sh
> wget -O - --http-user=username --http-passwd=password,
>
'http://dynamic.zoneedit.com/auth/dynamic.html?host=www.mydomain.com
> '
>
> Then every time dhclient runs (IE: at bootup and lease expire)
> the dhclient-exit-hooks.sh gets run.

Yes.

As another example, my own script for a similar purpose:

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