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authorIndrajith K L2022-12-03 17:00:20 +0530
committerIndrajith K L2022-12-03 17:00:20 +0530
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+tty(P) 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, Section 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 internationaliza-
+ tion variables that are unset or null. (See the
+ Base Definitions volume of IEEE Std 1003.1-2001,
+ Section 8.2, Internationalization Variables for
+ the precedence of internationalization variables
+ used to determine the values of locale cate-
+ gories.)
+
+ LC_ALL If set to a non-empty string value, override the
+ values of all the other internationalization
+ 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 arguments).
+
+ LC_MESSAGES
+ Determine the locale that should be used to
+ affect the format and contents of diagnostic mes-
+ sages written to standard error and informative
+ messages written to standard 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 stan-
+ dard 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 Operat-
+ ing 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 original Standard
+ can be obtained online at http://www.open-
+ group.org/unix/online.html .
+
+
+
+POSIX 2003 tty(P)