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A representation of a device that asynchronously transmits and receives serial data.

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My understanding of tty is is that its means "teletype writers" from the older days, where people had to get teletype writers in order to receive and input data into virtual terminals, my questions … are: What does tty represent in Linux? What is tty actually used for in Linux? Why is there so many tty files, such as tty1, tty2, tty3, etc. How does tty work? …
asked Mar 21 by Qasim