New User - options and other "get going" questions.

Hi,
I have just installed the lastest PostGreSQL version as an RPM. I am
using the /etc/init.d/postgresql file provided to start and stop. I am not
that conversant with shell programming (YET).

I want to keep tables in "/rwhdata2/data" rather than
/var/lib/pgsql/data". I presume that $PGDATA is set to
"/var/lib/pgsql/data", but I can't find out where.

Typing "echo $PGDATA" logged in as either root or postgres returns a
blank line. Can someone point me in the right direction. I have three
books on my desk that purport to explain Postgresql and they all mention
PGDATA but none clearly delineate where it is set.

Thanks,

Bob

Please reply directly as I am not sure that I am getting any list traffic
even though I checked to receive all messages when I subscribed. Thanks!