The following bug has been logged online:
Bug reference: 6058
Logged by: Rikard Pavelic
Email address: rikard.pavelic@zg.htnet.hr
PostgreSQL version: 9.1 beta2
Operating system: Windows 7 64
Description: psql password prompt
Details:
psql doesn't hide password in prompt
psql -U postgres < prevoious.sql
password: password visible in clear text