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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 comprised of 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.

     The first field is	normally the name of the terminal special file as it
     is	found in /dev.	However, it can	be any arbitrary string	when the asso-
     ciated command is not related to a	tty.

     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.  It can be,
     however, any desired command, for example the start up for	a window sys-
     tem terminal emulator or some other daemon	process, and can contain mul-
     tiple 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)),
     specify a window system process that init(8) will maintain	for the	termi-
     nal line, optionally determine the	type of	tty (whether dialin, network
     or	otherwise), or specify a tty group name	that allows the	login class
     database (see login.conf(5)) to refer to many ttys	as a group, to selec-
     tively allow or deny access or enable or disable accounting facilities
     for ttys as a group.

     As	flag values, the strings ``on''	and ``off'' specify that init(8)
     should (should not) execute the command given in the second field,	while
     ``secure''	(if ``on'' is also specified) allows users with	a uid of 0 to
     login on this line.  The flag ``dialin'' indicates	that a tty entry de-
     scribes a dialin line, and	``network'' indicates that a tty entry pro-
     vides a network connection.  Either of these strings may also be speci-
     fied in the terminal type field.  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	``group='' may be followed by a	group name comprised of	al-
     phanumeric	characters that	can be used by login.conf(5) to	refer to many
     tty lines as a group to enable or disable access and accounting facili-
     ties.  If no group	is specified, then the tty becomes a member of the
     group "none".  For	backwards compatibility, the ``group=''	should appear
     last on the line, immediately before the optional comment.

     Both the second field and any command specified with ``window='' will be
     split into	words and executed using execve(2).  Words are separated by
     any combinations of tabs and spaces.  Arguments containing	whitespace
     should be enclosed	in single quotes (').  Note that no shell-style	glob-
     bing or other variable substitution occurs.


     # 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	group=dialup # 555-1234
     # Mike's terminal:	hp2621
     ttyh0   "/usr/libexec/getty std.9600"   hp2621-nl	     on	group=dialup # 457 Evans
     # John's terminal:	vt100
     ttyh1   "/usr/libexec/getty std.9600"   vt100   on	group=dialup	     # 459 Evans
     # terminal	emulate/window system
     ttyv0   "/usr/local/bin/xterm -display :0"	     xterm   on	window="/usr/local/bin/X :0"
     # Network pseudo ttys -- don't enable getty
     ttyp0   none    network	     group=pty
     ttyp1   none    network off     group=pty

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

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

BSD				 May 27, 2005				   BSD


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