Help with chpst -e

[Robin Bowes <robin-lists@robinbowes.com>]

Hi,

Is it possible to set vars using "chpst -e" and then use those vars 
later in the same command line?

e.g.

mkdir env
echo dnslog > env/LOGUSER
echo /var/log/dnscache > env/LOGDIR

Then in run:
#!/bin/sh
exec chpst -e ./env -u $LOGUSER svlogd -tt $LOGDIR

I realise that this specific example won't work - $LOGUSER and $LOGDIR 
will both retain the values they had when the script was launched.

Is what I describe above possible?

Thanks,

R.