tty - return user's terminal name
tty [-l] [-s]
The tty utility writes to the standard output the name of
the terminal that is open as standard input. The name that
is used is equivalent to the string that would be returned
by the ttyname(3C) function.
The following options are supported:
-l Prints the synchronous line number to which the user's
terminal is connected, if it is on an active synchro-
-s Inhibits printing of the terminal path name, allowing
one to test just the exit status.
See environ(5) for descriptions of the following environment
variables that affect the execution of tty: LANG, LC_ALL,
LC_CTYPE, LC_MESSAGES, and NLSPATH.
The following exit values are returned:
0 Standard input is a terminal.
1 Standard input is not a terminal.
>1 An error occurred.
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWcsu |
| CSI | enabled |
| Interface Stability | Standard |
isatty(3C), ttyname(3C), attributes(5), environ(5), stan-
not on an active synchronous line
The standard input is not a synchronous terminal and
-l is specified.
not a tty
The standard input is not a terminal and -s is not
The -s option is useful only if the exit status is wanted.
It does not rely on the ability to form a valid path name.
Portable applications should use test -t.
Man(1) output converted with