I would like to disable all extensions, what is the simplest way for Magento 2
You can use one command line to disabled all Magento 2 extensions or custom modules
php bin/magento module:status | grep -v Magento | grep -v List | grep -v None | grep -v -e ‘^$’| xargs php bin/magento module:disable
Enable all extensions or modules
php bin/magento module:status | grep -v Magento | grep -v List | grep -v None | grep -v -e ‘^$’| xargs php bin/magento module:enable