Re: passing environment variables back to shell
On Tuesday 24 June 2003 06:05, Matt Price wrote:
> Hi,
>
> anyone know if it's possible to pass the value of variables assigned
> within a bash script back out to the executing shell? Or better yet,
> to all subsequent shells?
>
> I've written a tiny script to figure out the IP address of my
> (dynamically assigned) home computer and pass it to ipmasq on my work
> computer. I would like to run this as a cron job (probably daily,
> since my IP is pretty stable) and only rerun ipmasq if the new IP
> address differs from the old one. But I don't understand howto pass
> the new value back out to the executing environment.
>
> I think if you look at the script you'll see what I'm trying to do...
>
> /usr/local/scripts/gethomeip :
> -------------------------------------------
> #!/bin/bash
> HOSTRESULT=`host youknowwho.dyndns.org`
> RESULTIP=`echo ${HOSTRESULT##[^0-9]*[^0-9\.]}`
>
> # check the initial values
> echo "$RESULTIP"
> echo "$MATTSIP"
> if [ "$RESULTIP" = "$MATTSIP" ]
> then
> echo "no problem, the address is up to date"
> else
>
> #set the new value
> MATTSIP=$RESULTIP
> echo "$MATTSIP"
>
> # export -- but of course it only exports to daughter processes, not parent
> processes export MATTSIP
> ipmasq
> fi
>
> # check to make sure the variables been set within the script
> echo "$MATTSIP"
>
> -----------------------------------------------
>
> obviously export isn't what I'm looking for. Any ideas what I ought
> to substitute there? thanks,
>
> matt
Hi
I don't know ipmasq, but you could use the output of the script as an input
for the command in the cronjob:
<command> `yourscript`
make sure you have the right "`" (in my keyboard - us 105 keys, it's with the
"~" sign).
Bye
--
Haim
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