TTY(1) (User Environment Utilities) TTY(1)
NAME
tty - get the name of the terminal
SYNOPSIS
tty [ -l ] [ -s ]
DESCRIPTION
tty prints the path name of the user's terminal.
-l prints the synchronous line number to which the user's
terminal is connected, if it is on an active
synchronous line.
-s inhibits printing of the terminal path name, allowing
one to test just the exit code.
EXIT CODES
2 if invalid options were specified,
0 if standard input is a terminal,
1 otherwise.
DIAGNOSTICS
``not on an active synchronous line'' if the standard input
is not a synchronous terminal and -l is specified.
``not a tty'' if the standard input is not a terminal and -s
is not specified.
Page 1 May 1989