TTY(1) User Commands TTY(1)


NAME


tty - return user's terminal name

SYNOPSIS


/usr/bin/tty [-l] [-s]


ksh93
tty [ options ]


DESCRIPTION


/usr/bin/tty
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.

ksh93
The ksh93 tty built-in writes the name of the terminal that is connected
to standard input onto standard output. If the standard input is not a
terminal, "not a tty" will be written to standard output.

OPTIONS


The following options are supported:

/usr/bin/tty
-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 status.


ksh93
-l
--line-number
Write the synchronous line number of the terminal on a
separate line following the terminal name line. If the
standard input is not a synchronous terminal then "not
on an active synchronous line" is written.


-s
--silent|quiet
Disable the terminal name line. Portable applications
should use [[ -t 0 ]] instead.


ENVIRONMENT VARIABLES


See environ(7) for descriptions of the following environment variables
that affect the execution of tty: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES,
and NLSPATH.

EXIT STATUS


The following exit values are returned:

0
Standard input is a terminal.


1
Standard input is not a terminal.


>1
An error occurred.


ATTRIBUTES


See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|CSI | Enabled |
+--------------------+-----------------+
|Interface Stability | Committed |
+--------------------+-----------------+
|Standard | standards(7). |
+--------------------+-----------------+

SEE ALSO


isatty(3C), ttyname(3C), attributes(7), environ(7), standards(7)

DIAGNOSTICS


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 specified.


NOTES


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.


August 11, 2009 TTY(1)