The following bug has been logged online:

Bug reference: 2484
Logged by: Yu-Lung Shao
Email address: allen_shao (AT) seed (DOT) net.tw
PostgreSQL version: 8.1.4-1
Operating system: WinXP Home
Description: pg_dump not support < redirect
Details:

file: backup.cmd

pg_dump.exe dbname -U postgres -W -f dbname.sql <
password.txt

in 8.0.3 is work

in 8.1.4 is not work need manual key in password.

---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match

The bug is in 8.0.3 (and <=3D 8.1.3 as well), fixed in the latest
versions. If you want to pass the password to pg_dump, use pgpass.conf
or the PGPASSWORD environment variable.

//Magnus

---------------------------(end of broadcast)---------------------------
TIP 3: Have you checked our extensive FAQ?

http://www.postgresql.org/docs/faq