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This question already has an answer here:

I am a student and new to ubuntu. I read about tty command in the questions people posted earlier but couldn't understand the answers. Could anybody explain it in a more easy way? :)

marked as duplicate by Pilot6, Sergiy Kolodyazhnyy, muru, Takkat, Fabby Aug 13 '15 at 18:57

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Which questions did you read and what didn't you understand? – muru Aug 13 '15 at 15:37
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This link might help:

https://stackoverflow.com/questions/4426280/what-do-pty-and-tty-mean

Some very good explanations there.

tty stands for teletype - the original terminals used a line printer for output (as opposed to a screen or terminal as you find today) and a keyboard for input. A pty is a pseudo-terminal.

Both terms have survived the annals of time.

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