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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 un-

     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 de-
     pendent.  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 tty(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), tty(4), gettytab(5), termcap(5),
     getty(8), init(8),	ttyflags(8)

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

BSD				October	7, 2006				   BSD


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