PG_DUMP question - Mailing list pgsql-general

Hi,
is ther a way to pass a password to the pg_dump command to avoid being
prompted for it.
I want to execute the dump from a perl or shell script and dont want to
open accees for the user in the pg_hba.conf

I tried
PGUSER=userid PGPASSWD=passwd pg_dump -Fc -f dump.db mydb;

Thanks
Alex