Updated: 2021/Apr/14

TTY(1)                      General Commands Manual                     TTY(1)

     tty - return user's terminal name

     tty [-s]

     The tty utility writes the name of the terminal attached to standard
     input to standard output.  The name that is written is the string
     returned by ttyname(3).  If the standard input is not a terminal, the
     message ``not a tty'' is written.  The options are as follows:

     -s      Don't write the terminal name; only the exit status is affected
             when this option is specified.  The -s option is deprecated in
             favor of the "test -t 0" command.

     tty exits 0 if the standard input is a terminal, 1 if the standard input
     is not a terminal, and >1 if an error occurs.

     test(1), ttyname(3)

     The tty utility conforms to IEEE Std 1003.2-1992 ("POSIX.2").

     A tty utility appeared in Version 1 AT&T UNIX.

NetBSD 9.99                    September 1, 2019                   NetBSD 9.99