User Commands                                              tty(1)



NAME
     tty - return user's terminal name


SYNOPSIS
  /usr/bin/tty
     /usr/bin/tty [ options ]

 
  ksh93
     tty [ options ]


DESCRIPTION
     tty writes the name of the terminal that is connected to
     not a standard input onto standard output. If the standard
     input is terminal, "not a tty" will be written to standard
     output.


OPTIONS
     The following options are supported:

     -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 test -t 0 or [[ -t 0 ]]
                     instead.




ENVIRONMENT VARIABLES
     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.


EXIT STATUS
     The following exit values are returned:

       0     Standard input is a tty.
       1     Standard input is not a tty.
       2     Invalid arguments.
     >=3     A an error occurred.


ATTRIBUTES
     See attributes(5) for descriptions of the  following
     attributes:

     ___________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE      |
    |_____________________________|____________________________|
    | Availability                | SUNWcsu                    |
    |_____________________________|____________________________|
    | CSI                         | enabled                    |
    |_____________________________|____________________________|
    | Interface Stability         | Commited                   |
    |_____________________________|____________________________|

    This command conforms to IEEE Std 1003.1-2008.


SEE ALSO
     ksh93(1), test(1), isatty(3C), ttyname(3C),  attributes(5),
     environ(5), standards(5),
     http://www.opengroup.org/onlinepubs/9699919799/utilities/tty.html


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 or [[ -t 0 ]].


SunOS 5.10           Last change: 1 Feb 1995                    2