Tty (Unix)

tty
tty command on a Void Linux machine
Initial release	November 3, 1971; 53 years ago (1971-11-03)
Operating system	Unix and Unix-like
Platform	Cross-platform
Type	Command

In computing, tty is a command in Unix and Unix-like operating systems to print the file name of the terminal connected to standard input.^[1][2]

tty stands for "teletypewriter".^[3]

The tty command is commonly used to check if the output medium is a terminal. The command prints the file name of the terminal connected to standard input. If no file is detected (in case, it's being run as part of a script or the command is being piped) "not a tty" is printed to stdout and the command exits with an exit status of 1. The command also can be run in silent mode (tty -s) where no output is produced, and the command exits with an appropriate exit status.^[4]

• Pseudoterminal
• Teleprinter

• tty – Shell and Utilities Reference, The Single UNIX Specification, Version 5 from The Open Group
• tty(1) – FreeBSD General Commands Manual
• tty(1) – NetBSD General Commands Manual
• tty(1) – OpenBSD General Commands Manual
• tty(1) – Solaris 11.4 User Commands Reference Manual
• tty(1) – Linux User Commands Manual

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