See the on the PostgresSQL wiki for more information for all platforms.

The downloads page also includes some live CDs which make it dead easy to set up a test server; simply boot the CD and go to work. For this article, I used a Debian Wheezy (Testing) system running PostgreSQL 9.0.4, the current stable release.

You'll have to jump through a number of startup and user account hurdles to get started. First, verify that your PostgreSQL server has started by opening psql, its interactive command shell:

$