Updating Magento 1 via SSH

cd ~/public
chmod 750 mage
./mage mage-setup .
./mage config-set preferred_state stable
./mage sync
./mage install https://connect20.magentocommerce.com/community Mage_All_Latest --force
php shell/indexer.php reindexall
rm -rf downloader/.cache/ var/cache/