TTY(1) MachTen Reference Manual TTY(1)

NAME
tty - return user’s terminal name

SYNOPSIS
tty [-s]

DESCRIPTION
The tty utility writes the name of the terminal attached to standard in-
put 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 ALSO
test(1), ttyname(3)

STANDARDS
The tty function is expected to be IEEE Std1003.2 (‘‘POSIX’’) compatible.

4.4BSD June 6, 1993 1