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 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.
SEE ALSOtest(1), ttyname(3)STANDARDS
The tty function is expected to be IEEE Std 1003.2 (“POSIX.2”) compati‐
BSD June 6, 1993 BSD