tty(1) — AIX/RT 2.2.1

tty

PURPOSE

     Writes to standard output the full path name of your work
     station.

SYNOPSIS
     tty [ -s ]


DESCRIPTION

     The tty command  writes the name of your  work station to
     standard output.

FLAG

     -s Suppresses reporting  the path  name.  The  exit value
        has the following possible meanings:
        0  Standard input is a work station.
        1  Standard input is not a work station.
        2  Invalid flags specified.

     If your standard  input is not a work station  and you do
     not specify the -s flag, you get the message "not a tty".

EXAMPLES

     1.  To display full path name of your work station:

           tty

     2.  To test whether  or not the standard input  is a work
         station:

           if tty -s
           then
              echo 'Enter the text to print:' >/dev/tty
           fi
           print

         If the  standard input is  a work station,  this dis-
         plays the  message "Enter  the text  to print:"  as a
         prompt and prints  the text that the  user types.  If
         the standard input  is not a work  station, this dis-
         plays nothing.   It merely prints the  text read from
         the standard input.

         The "echo . . . >/dev/tty" displays the prompt on the
         screen even  if you  redirect the standard  output of
         the shell  procedure.  This  way the prompt  is never
         written  into  an  output  file.   The  special  file
         /dev/tty always refers your work station, although it
         also has another name like /dev/console or /dev/tty2.
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