Topic: DynDns - Keeping it up to date

[Anonymous]

PhilV, you can try the folllowing.

Change to a directory of your chosing.
Open a new file. ie vi update.sh
Enter in the following code (change words that start with a % to your values)

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#!/bin/bash

curr_ip=wget -q -O- http://www.whatismyip.com/ | grep "Your IP is " - | cut -d" " -f4

old_ip=cat ip.tmp

logger -t dyndns.org "Stored IP : $old_ip"
logger -t dyndns.org "Current IP: $curr_ip"

if [ "$old_ip" = "$curr_ip" ]; then
logger -t dyndns.org "Action: no update"
else
logger -t dyndns.org  "Action: update"
/sbin/e-smith/dynamic-dns/dyndns.org $curr_ip %username %password %domain
echo $curr_ip > ip.tmp
logger -t dyndns.org  "Status: updated"
fi


Hmm, had a go at this, but at the point where we are trying to get curr_ip and old_ip, rather than execute the instructions in the single quotes, it seems to just place that text into the variable. i.e.

$old_ip ends up containing:

cat ip.tmp

I can tell this by looking in my /var/log/messages

Any ideas how to fix this?

Thx,

Phil

[PhilV]

I'm not sure what is happening here!

I have made a test file, with just a few lines in it:
(I have put some basic text into a file called ip.tmp just for testing purposes)

Code: [Select]

#!/bin/sh
#file called mytest
BOB='cat ip.tmp'
$BOB
logger -t dyndns.org "TRIAL: $BOB"

If at the terminal i type:

Code: [Select]

# ./mytest

I get a response at the command line of:

Code: [Select]

This is the contents of the ip.tmp file

But in my /var/log/messages file I get:

Code: [Select]

dyndns.org: TRIAL: cat ip.tmp

Any ideas?

[PhilV]

ARGHHH!!!

Now I see the problem!

Have to be VERY careful to make sure I use  not '

Oh well, now to try again!

[nigeltodd]

DDClient will also letu use the NIC interface to ur cable or dsl modem. That way if the link fails, it will reset every time! however, I also have a problem getting DDCLient to work properly for a virtual domain. ANy ideas?