With the « FROM » information, you indicate to the system the table in which the data set to be deleted is located. With the “WHERE” information, you specify the condition that the dataset must meet in order to be deleted. If you do not fill in the condition relating to « WHERE », then the entire row is deleted.

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Ubuntu FTP server: How to configure it?
An Ubuntu FTP server allows both downloading and sending files, each access being controlled by a separate connection. In this tutorial on the Ubuntu FTP