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Linux 2.6 - man page for tty (linux section 1posix)

TTY(P)				    POSIX Programmer's Manual				   TTY(P)

NAME
       tty - return user's terminal name

SYNOPSIS
       tty

DESCRIPTION
       The  tty  utility shall write to the standard output the name of the terminal that is open
       as standard input. The name that is used shall be equivalent to the string that	would  be
       returned   by   the  ttyname()  function  defined  in  the  System  Interfaces  volume  of
       IEEE Std 1003.1-2001.

OPTIONS
       The tty utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, Sec-
       tion 12.2, Utility Syntax Guidelines.

OPERANDS
       None.

STDIN
       While  no input is read from standard input, standard input shall be examined to determine
       whether or not it is a terminal, and, if so, to determine the name of the terminal.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of tty:

       LANG   Provide a default value for the internationalization variables that  are	unset  or
	      null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Inter-
	      nationalization Variables for the precedence of internationalization variables used
	      to determine the values of locale categories.)

       LC_ALL If  set  to a non-empty string value, override the values of all the other interna-
	      tionalization variables.

       LC_CTYPE
	      Determine the locale for the interpretation of sequences of bytes of text  data  as
	      characters  (for	example, single-byte as opposed to multi-byte characters in argu-
	      ments).

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic messages written to standard error and informative messages written to stan-
	      dard output.

       NLSPATH
	      Determine the location of message catalogs for the processing of LC_MESSAGES .

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       If standard input is a terminal device, a pathname of the terminal  as  specified  by  the
       ttyname()  function  defined in the System Interfaces volume of IEEE Std 1003.1-2001 shall
       be written in the following format:

	      "%s\n", <terminal name>

       Otherwise, a message shall be written indicating that standard input is not connected to a
       terminal. In the POSIX locale, the tty utility shall use the format:

	      "not a tty\n"

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

	0     Standard input is a terminal.

	1     Standard input is not a terminal.

       >1     An error occurred.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       This  utility  checks  the  status  of  the file open as standard input against that of an
       implementation-defined set of files. It is possible that no match can be  found,  or  that
       the  match  found  need	not  be the same file as that which was opened for standard input
       (although they are the same device).

EXAMPLES
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The System Interfaces volume of IEEE Std 1003.1-2001, isatty(), ttyname()

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					   TTY(P)


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