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Which file is used for indicating terminals?

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Which file is used for indicating terminals?

(a) /dev/tty

(b) /dev/null

(c) terminal file

(d) device file

I got this question in homework.

My doubt stems from Redirection and Pipes topic in division The Shell of Unix

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Right answer is (a) /dev/tty

For explanation I would say: /dev/tty is another special file which is used for representing one’s terminal. Consider user1 is working on terminal /dev/pts/1 and user 2 is working on /dev/pts/2. Then, both the users can refer to their own terminals with the same filename. For example, if user 1 issues the command

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