A very abbreviated Drupal 6 settings.php file.

Drupal_6-settings.php

<?php

/**
 * Database URL format:
 *   $db_url = 'mysqli://username:password@localhost/databasename';
 */
$db_url = 'mysqli://username:password@localhost/databasename';
$db_prefix = '';

// Access control for update.php script
$update_free_access = FALSE;

// Base URL (optional).
# $base_url = 'http://www.example.com';  // NO trailing slash!

// Error reporting. 1 = Write errors to log and screen, 2 = Write to log but do not display.
// Set to 2 for production sites.
$conf['error_level'] = 1;

// PHP settings:
ini_set('arg_separator.output',     '&amp;');
ini_set('magic_quotes_runtime',     0);
ini_set('magic_quotes_sybase',      0);
ini_set('session.cache_expire',     200000);
ini_set('session.cache_limiter',    'none');
ini_set('session.cookie_lifetime',  0);
ini_set('session.gc_maxlifetime',   200000);
ini_set('session.save_handler',     'user');
ini_set('session.use_cookies',      1);
ini_set('session.use_only_cookies', 1);
ini_set('session.use_trans_sid',    0);
ini_set('url_rewriter.tags',        '');

/**
 * Drupal automatically generates a unique session cookie name for each site
 * based on on its full domain name. If you have multiple domains pointing at
 * the same Drupal site, you can either redirect them all to a single domain
 * (see comment in .htaccess), or uncomment the line below and specify their
 * shared base domain. Doing so assures that users remain logged in as they
 * cross between your various domains.
 */
# $cookie_domain = '';

// A custom theme can be set for the off-line page.
# $conf['maintenance_theme'] = 'minnelli';

// Cache and performance settings.
// Set to 1 for on, 0 for off.
$conf['preprocess_css'] = 1;
$conf['preprocess_js'] = 1;
$conf['cache'] = 1;
$conf['block_cache'] = 1;
$conf['file_directory_temp'] = '/tmp';
$conf['file_directory_path'] = 'sites/default/files';