TTY(1) BSD General Commands Manual TTY(1)NAMEtty — return user's terminal name
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 Do not 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.
The tty utility exits 0 if the standard input is a terminal, 1 if the
standard input is not a terminal, and >1 if an error occurs.
SEE ALSOtest(1), ttyname(3)STANDARDS
The tty utility is expected to be IEEE Std 1003.2 (“POSIX.2”) compatible.
A tty command appeared in Version 1 AT&T UNIX.
BSD June 6, 1993 BSD