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

NAME

     ttys -- terminal initialization information

DESCRIPTION

     The file ttys contains information that is used by various routines to initialize and control the use of terminal special files.  This infor-
     mation 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, usually 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
     environment variable TERM is initialized with the value by either getty(8) or login(1).

     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 unused).

     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 the TIOCFLAG_CLOCAL tty(4) flag for the device.  This will cause the termios(4) CLOCAL flag to be set on every open and thus
	      modem control signal lines will be ignored by default.

     softcar  Causes the driver to ignore hardware carrier on the line (by setting the TIOCFLAG_SOFTCAR tty(4) flag).

     rtscts   Sets the TIOCFLAG_CRTSCTS tty(4) flag for the device to enable RTS / CTS "hardware" flow control by default.

     mdmbuf   Sets the TIOCFLAG_MDMBUF tty(4) flag for the device to enable DTR / DCD "hardware" flow control by default.

     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 field.

     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 tty(4) device flags listed above; the ttyflags(8) program must
     be run for changes in those flags to take effect on the devices.

FILES

     /etc/ttys

EXAMPLES

     # 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

SEE ALSO

     login(1), getttyent(3), ttyslot(3), tty(4), gettytab(5), termcap(5), getty(8), init(8), ttyflags(8)

HISTORY

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

BSD
								  October 7, 2006							       BSD