pg_dump shell script with ~/.pgpass

I need to create a shell script for cron.daily to run that will do pg_dump
for my database. I am using Redhat 9 and Postgresql v7.3.4.  Currently when
I run the dump manually the command I use is

#pg_dump -u -C -D -f /tmp/owl.sql owl

What should the command look like using ~/.pgpass ?

My other question... Is cron.daily is being run by root? If so would I need
to put the .pgpass file in root's home directory?

I only have two postgresql users right now, myself and postgres.  On the
redhat server I have only two users, myself and root, there is no user
postgres.

TIA.
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Margaret Gillon, IS Dept., Chromalloy Los Angeles, ext. 297