With the following example ~/.borisrc you can use ENV vars to change the Symfony2 configuration environment and debug mode easily before envoking Boris.
<?php
require '<path-to-your>/boris-loader.php';
// getenv returns false if ENV var is not found
$config = getenv('BORIS_SYMFONY_ENV');
$debug = getenv('BORIS_SYMFONY_DEBUG');
// Use found value or set defaults
$config = $config ? $config : 'dev';
$debug = $debug ? $debug : true;
\Boris\Loader\Loader::load($boris, array(
new \Boris\Loader\Provider\Symfony2($config, $debug),
));
Before envoking Boris you can export the ENV vars as suits
$ export BORIS_SYMFONY_ENV=prod
$ export BORIS_SYMFONY_DEBUG=false
$ boris