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NetBSD 6.1.5 - man page for ttys (netbsd section 5)

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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 con-
     trol the use of terminal special files.  This information 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
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