Command Controller
The "tea" extension comes with a CommandController that can be used for the automatic creation of test data. It also serves to illustrate how data can be created in the database using a command controller.
You must set a page id as argument. Therefore it's necessary to create an sysfolder before.
You can add option -d to delete already existing data.
vendor/bin/typo3 tea:create-test-data 3
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See also
For further details to Console Commands read the Creating a basic command tutorial.