A TXT file represents plain, unformatted text files. They are convenient for storing information that should not contain any particular font or formatting. The advantage: an additional reading program is not necessary. On most systems, tools are even pre-installed to read files in TXT format. To learn how to open a TXT file, click here.

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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