Thread:Project:Support desk/SSH console problem

Hi, I recently installed MediaWiki 1.23.4 and I tried to install an extension and I tried to run the $ php update.php command on an SSH console and it didn't work, it said it was an unknown command so I swiched to the directory /public_html/wiki/maintenance and retried and it still said it was invalid! I tried command run and it didn't work, help!!!

Additional info:
 * System hosting my wiki: Linux Debian or Ubuntu
 * Hosting Services: Hostinger UK
 * PHP Version: 5.5