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TTYS(5)                     BSD File Formats Manual                    TTYS(5)

     ttys -- terminal initialization information

     The file ttys contains information that is used by various routines to
     initialize and control the use of terminal special files.  This informa-
     tion is read with the getttyent(3) library routines.

     There is one line in the ttys file per special device file.  Fields are
     separated by tabs and/or spaces.  Fields comprising more than one word
     should be enclosed in double quotes (``"'').  Blank lines and comments
     may appear anywhere in the file; comments are delimited by hash marks
     (``#'') and new lines.  Any unspecified fields will default to null.

     Each line in ttys has the format:
           tty command type flags

     The first field is the name of the terminal special file as it is found
     in /dev.

     The second field of the file is the command to execute for the line, usu-
     ally getty(8), which initializes and opens the line, setting the speed,
     waiting for a user name and executing the login(1) program.  However, it
     can be any desired command, for example the start up for a window system
     terminal emulator or some other daemon process, and can contain multiple
     words if quoted.

     The third field is the type of terminal usually connected to that tty
     line, normally the one found in the termcap(5) data base file.  The envi-
     ronment variable TERM is initialized with the value by either getty(8) or

     The remaining fields set flags in the ty_status entry (see getttyent(3))
     or specify a window system process that init(8) will maintain for the
     terminal line or a key into a database of tty attributes (currently

     on or off
              init(8) should (or should not) execute the command given in the
              second field.

     secure   If on is specified, allows users with a uid of 0 (e.g. "root")
              to login on this line.

     local    Sets CLOCAL termios(4) flag for the device.  Tells device to
              ignore modem control signal lines.

     softcar  Causes the driver to ignore hardware carrier on the line.

     rtscts   Sets CRTSCTS termios(4) flag for the device to enable RTS / CTS
              "hardware" flow control.

     mdmbuf   Sets MDMBUF termios(4) flag for the device to enable DTR / DCD
              "hardware" flow control.

     The flags "local", "rtscts", "mdmbuf", and "softcar" modify the default
     behaviour of the terminal line, and their actions are device driver
     dependent.  These flag fields should not be quoted.

     The string ``window='' may be followed by a quoted command string which
     init(8) will execute before starting the command specified by the second

     The string ``class='' may be followed by a quoted string used as a key
     into a database of attributes for that category of tty.  See getttynam(3)
     for more information on this feature.

     After changing the ttys file a SIGHUP signal can be sent to init(8) with
     the command ``kill -s HUP 1''.  On receipt of this signal, init(8) will
     re-read the ttys file and spawn any necessary getty(8) processes.

     Nota Bene: Sending SIGHUP to init(8) does not change the state of the
     various termios(4) device flags listed above; the ttyflags(8) program
     must be run for changes in those flags to take effect on the devices.


     # root login on console at 1200 baud
     console "/usr/libexec/getty std.1200"   vt100   on secure
     # dialup at 1200 baud, no root logins
     ttyd0   "/usr/libexec/getty d1200"      dialup  on      # 555-1234
     # Mike's terminal: hp2621
     ttyh0   "/usr/libexec/getty std.9600"   hp2621-nl       on      # 457 Evans
     # John's terminal: vt100
     ttyh1   "/usr/libexec/getty std.9600"   vt100   on              # 459 Evans
     # terminal emulate/window system
     ttyv0   "/usr/new/xterm -L :0"          vs100   on window="/usr/new/Xvs100 0"
     # Network pseudo ttys -- don't enable getty
     ttyp0   none    network
     ttyp1   none    network off

     login(1), getttyent(3), ttyslot(3), gettytab(5), termcap(5), getty(8),
     init(8), ttyflags(8)

     A ttys file appeared in Version 6 AT&T UNIX.

BSD                              June 4, 1993                              BSD