The following bug has been logged online:
Bug reference: 4218
Logged by: Netzach
Email address: psql-webform-submitbug(at)netzach(dot)co(dot)il
PostgreSQL version: <=8.3
Operating system: Documentation
Description: PGOPTIONS not documented for psql
Details:
The psql man page and HTML documentation make no mention of the PGOPTIONS
environment variable. It is only documented with regard to the 'postgres'
command.
I fear other environment variables may also lie hidden and undocumented.