Another BASH Scripting question

[William Park]

On Mon, Feb 09, 2004 at 12:43:38PM -0500, Madison Kelly wrote:
> Hi all,
> 
>   Sorry for asking so many questions! I am on quite the learning curve 
> at the moment! :)
> 
>   I am on the last portion of my firewall script and I need something 
> like an array (though judging from what I have read on array's, not 
> exactly one).
> 
>   Here is what I am trying to do: I have rules for multiple servers. 
> Later on we will add more servers. I already will have to copy/paste the 
> variables and update the data for the servers but I don't want to have 
> to edit the actual script. To do this, I want to have the script read 
> the value from a variable but have part of that variable name itself be 
> dynamic. This is what is stumping me...
> 
>   In my head, I am trying to do this:
> 
> # How many servers do we have?
> SRV_NAME="SRV1 SRV2"
> 
> # Rules for server <server>
> SRV1_SNAT_IP="192.168.2.10:111.222.333.44
> SRV1_IB_TCP="22 25 53 80 110"
> SRV1_IB_UDP="22 25 53 80 110"
> SRV1_LAN_TCP="22>192.168.1.12"
> SRV1_LAN_TCP="22>192.168.1.12"
> 
> # Rules for server <server>
> SRV2_SNAT_IP="192.168.2.11:111.222.333.45
> SRV2_IB_TCP="22 80"
> SRV2_IB_UDP="22 80"
> SRV2_LAN_TCP="22>192.168.1.16"
> SRV2_LAN_TCP="22>192.168.1.16"
> 
> 
> echo -n "Checking to see if we have servers: "
> if [ "${SRV_NAME}" != "" ] ; then
> 	echo "we do!"
> 	echo "Setting up rules for each public server: "
> 	for server in ${SRV_NAME} ; do
> 		echo "Processing: "${server}
> 
> # Here is where things break!
> 
> 		echo "${server}_SNAT_IP" | {
> 			IFS=':' read pubip inetip
> 			echo "Internal IP: "${pubip}
> 			echo "Internet IP: "${inetip}
> 		}
> 	done
> fi
> 
> The output is:
> 
> Checking to see if we have servers: we do!
> Setting up rules for each server:
> Processing: SRV1
> Internal IP: SRV1_SNAT_IP
> Internet IP:
> Processing: SRV2
> Internal IP: SRV2_SNAT_IP
> Internet IP:
> 
> 
>   So, my problem is that the variable name is becoming the value... How 
> can I go about getting the value of to cobbled together variable name 
> instead?

Hint:
    for i in $SRV_NAME; do
	IFS=: read pubip inetip <<< "`eval echo \$${i}_SNAT_IP`"
    done

-- 
William Park, Open Geometry Consulting, <opengeometry-FFYn/CNdgSA at public.gmane.org>
Linux solution for data management and processing. 
--
The Toronto Linux Users Group.      Meetings: http://tlug.ss.org
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml