SQLSTATE[HY000] [2002] No such file or directory on running index.php

[seaniedan]

Hello! I changed the values in
/home/seaniedan/mywebserver.com/wiki/MediaWiki-to-DokuWiki-Importer-0.3.5/src/MediaWiki2DokuWiki/settings.php
to these directories and files, which exist and are writeable:

$settings['dokuwiki_dir'] = '/home/seaniedan/mywebserver.com/newDocuwiki/';
$settings['mediawiki_localsettings_file'] = '/home/seaniedan/mywebserver.com/oldMediawiki/LocalSettings.php';

but when I run
php index.php
I get:
SQLSTATE[HY000] [2002] No such file or directory
I suspect it's not finding the SQL database? How can I print the name of the database it's trying to query? I'm SSH'ing into my shared hosting (Dreamhost).