Specifying PostgreSQL data on startup

[Alexy Khrabrov]

I'd like to use the startup scripts for PostgreSQL 8.3 server, in

/opt/local/etc/LaunchDaemons/org.macports.postgresql83-server

with Lingon: http://tuppis.com/lingon/

Now the scripts allow for an environment variable to specify where  
your data is:

        su postgres -c "${PGCTL} -D ${POSTGRESQL83DATA:=/opt/local/var/ 
db/postgresql83/defaultdb} start -l /opt/local/var/log/postgresql83/ 
postgres.log"

However, it the server is started on boot, where does  
$POSTGRESQL83DATA come from?

Cheers,
Alexy
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