Enter Magento 2 folder
cd /home/username/public_html/
Reindex
php bin/magento indexer:reindex
Flush Cache
php bin/magento cache:flush
Magento version
php bin/magento --version
Disable a module
php bin/magento module:disable Magento_SOMEMODULE
Uninstall Magento
php bin/magento setup:uninstall
To get modules list:
php bin/magento module:status
Source: https://www.measureddesigns.com/magento-2-useful-commands/