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tty(1)                           User Commands                          tty(1)



NAME
       tty - return user's terminal name

SYNOPSIS
       tty [-l] [-s]

DESCRIPTION
       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.

OPTIONS
       The following options are supported:

       -l       Prints  the synchronous line number to which the user's termi-
                nal 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.



ENVIRONMENT VARIABLES
       See  environ(5) for descriptions of the following environment variables
       that affect the execution of  tty:  LANG,  LC_ALL,  LC_CTYPE,   LC_MES-
       SAGES,  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(5) for descriptions of the following attributes:


       tab()     allbox;     cw(2.750000i)|    cw(2.750000i)    lw(2.750000i)|
       lw(2.750000i).   ATTRIBUTE  TYPEATTRIBUTE   VALUE   AvailabilitySUNWcsu
       CSIenabled Interface StabilityStandard


SEE ALSO
       isatty(3C), ttyname(3C), attributes(5), environ(5), standards(5)

DIAGNOSTICS
       not on an active synchronous line

           The  standard  input is not a synchronous terminal and -l is speci-
           fied.



       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.



SunOS 5.10                        1 Feb 1995                            tty(1)