libexec/getty/ttys.5

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.\"     from: @(#)ttys.5	8.1 (Berkeley) 6/4/93
.\"	$Id$
.\" "
.Dd November 17, 1996
.Dt TTYS 5
.Os
.Sh NAME
.Nm ttys
.Nd terminal initialization information
.Sh DESCRIPTION
The file
.Nm ttys
contains information that is used by various routines to initialize
and control the use of terminal special files.
This information is read with the
.Xr getttyent 3
library routines.
There is one line in the
.Nm 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.
.Pp
The first field is the
name of the terminal special file as it is found in
.Pa /dev .
.Pp
The second field of the file is the command to execute for the line,
usually
.Xr getty 8 ,
which initializes and opens the line, setting the speed, waiting for
a user name and executing the
.Xr login 1
program.
It can be, however, 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.
.Pp
The third field is the type of terminal usually connected to that
tty line, normally the one found in the
.Xr termcap 5
data base file.
The environment variable
.Dv TERM
is initialized with the value by
either
.Xr getty 8
or
.Xr login 1 .
.Pp
The remaining fields set flags in the
.Fa ty_status
entry (see
.Xr getttyent 3 ),
specify a window system process that
.Xr init 8
will maintain for the terminal line, or specify a tty group
name that allows the login class database (see
.Xr login.conf 5 )
to refer to many ttys as a group, to selectively allow or
deny access or enable or disable accounting facilities for
ttys as a group.
.Pp
As flag values, the strings ``on'' and ``off'' specify that
.Xr init
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 flags ``local'', ``rtscts'', ``mdmbuf'', and ``softcar''
modify the default behaviour of the terminal line, and their actions
are driver dependent.
The ``local'' flag causes the driver to
treat the line as if it locally connected.
The ``rtscts'' flag
instructs the driver to use RTS/CTS hardware flow control, if
possible.
The ``mdmbuf'' flag instructs the driver to use
DTR/DCD flow control, if possible.
The ``softcar'' flag causes the driver to ignore
hardware carrier on the line.
These flag fields should not be quoted.
.Pp
The string ``window='' may be followed by a quoted command
string which
.Xr init
will execute
.Em before
starting the command specified by the second field.
.Pp
The string ``group='' may be followed by a group name comprised of
alphanumeric characters that can be used by
.Xr login.group 5
to refer to many tty lines as a group to enable or disable access
and accounting facilities.
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.
.Sh EXAMPLES
.Bd -literal
# 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/new/xterm -L :0"		vs100	on window="/usr/new/Xvs100 0"
# Network pseudo ttys -- don't enable getty
ttyp0	none	network 	group=pty
ttyp1	none	network	off	group=pty
.Ed
.Sh FILES
.Bl -tag -width /etc/ttys -compact
.It Pa /etc/ttys
.El
.Sh SEE ALSO
.Xr login 1 ,
.Xr getttyent 3 ,
.Xr ttyslot 3 ,
.Xr gettytab 5 ,
.Xr login.conf 5 ,
.Xr termcap 5 ,
.Xr getty 8 ,
.Xr init 8
.\".Xr init 8 ,
.\".Xr ttyflags 8
.Sh HISTORY
A
.Nm
file appeared in
.At v6 .