177 lines
6.1 KiB
Groff
177 lines
6.1 KiB
Groff
.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)ttys.5 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\" "
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.Dd August 3, 2018
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.Dt TTYS 5
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.Os
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.Sh NAME
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.Nm ttys
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.Nd terminal initialization information
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.Sh DESCRIPTION
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The file
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.Nm
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contains information that is used by various routines to initialize
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and control the use of terminal special files.
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Pseudo-terminals (see
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.Xr pts 4 )
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are not listed.
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This information is read with the
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.Xr getttyent 3
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library routines.
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There is one line in the
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.Nm
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file per special device file.
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Fields are separated by tabs and/or spaces.
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Fields comprised of more than one word should be enclosed in double
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quotes (``"'').
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Blank lines and comments may appear anywhere in the file; comments
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are delimited by hash marks (``#'') and new lines.
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Any unspecified fields will default to null.
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.Pp
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The first field is normally the
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name of the terminal special file as it is found in
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.Pa /dev .
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However, it can be any arbitrary string
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when the associated command is not related to a tty.
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.Pp
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The second field of the file is the command to execute for the line,
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usually
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.Xr getty 8 ,
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which initializes and opens the line, setting the speed, waiting for
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a user name and executing the
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.Xr login 1
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program.
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It can be, however, any desired command, for example
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the start up for a window system terminal emulator or some other
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daemon process, and can contain multiple words if quoted.
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.Pp
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The third field is the type of terminal usually connected to that
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tty line, normally the one found in the
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.Xr termcap 5
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data base file.
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The environment variable
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.Ev TERM
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is initialized with the value by
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either
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.Xr getty 8
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or
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.Xr login 1 .
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.Pp
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The remaining fields set flags in the
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.Fa ty_status
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entry (see
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.Xr getttyent 3 ) ,
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specify a window system process that
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.Xr init 8
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will maintain for the terminal line, optionally determine the
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type of tty (whether dialin, network or otherwise),
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or specify a tty group
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name that allows the login class database (see
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.Xr login.conf 5 )
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to refer to many ttys as a group, to selectively allow or
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deny access or enable or disable accounting facilities for
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ttys as a group.
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.Pp
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As flag values, the strings ``on'' and ``off'' specify that
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.Xr init 8
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should (should not) execute the command given in the second field.
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``onifconsole'' will cause this line to be enabled if and only if it is
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an active kernel console device (it is equivalent to ``on'' in this
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case).
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The flag ``onifexists'' will cause this line to be enabled if and only
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if the name exists.
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If the name starts with a ``/'', it will be considered an absolute
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path.
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Otherwise, it is considered a path relative to
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.Pa /dev .
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The flag ``secure'' (if the console is enabled) allows users with a
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uid of 0 to login on
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this line.
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The flag ``dialin'' indicates that a tty entry describes a dialin
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line, and ``network'' is obsolete and does nothing.
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Either of these strings may also be specified in the terminal type
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field.
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The string ``window='' may be followed by a quoted command
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string which
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.Xr init 8
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will execute
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.Em before
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starting the command specified by the second field.
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.Pp
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The string ``group='' may be followed by a group name comprised of
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alphanumeric characters that can be used by
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.Xr login.conf 5
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to refer to many tty lines as a group to enable or disable access
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and accounting facilities.
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If no group is specified, then the tty becomes a member of the group
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"none".
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For backwards compatibility, the ``group='' should appear last on the
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line, immediately before the optional comment.
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.Pp
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Both the second field and any command specified with ``window=''
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will be split into words and executed using
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.Xr execve 2 .
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Words are separated by any combinations of tabs and spaces.
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Arguments containing whitespace should be enclosed in single quotes
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.Pq Li ' .
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Note that no shell-style globbing or other variable substitution occurs.
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.Sh FILES
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.Bl -tag -width /etc/ttys -compact
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.It Pa /etc/ttys
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.El
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.Sh EXAMPLES
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.Bd -literal
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# root login on console at 1200 baud
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console "/usr/libexec/getty std.1200" vt100 on secure
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# dialup at 1200 baud, no root logins
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ttyd0 "/usr/libexec/getty d1200" dialup on group=dialup # 555-1234
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# Mike's terminal: hp2621
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ttyh0 "/usr/libexec/getty std.9600" hp2621-nl on group=dialup # 457 Evans
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# John's terminal: vt100
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ttyh1 "/usr/libexec/getty std.9600" vt100 on group=dialup # 459 Evans
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# terminal emulate/window system
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ttyv0 "/usr/local/bin/xterm -display :0" xterm on window="/usr/local/bin/X :0"
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.Ed
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.Sh SEE ALSO
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.Xr login 1 ,
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.Xr getttyent 3 ,
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.Xr gettytab 5 ,
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.Xr login.conf 5 ,
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.Xr termcap 5 ,
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.Xr getty 8 ,
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.Xr init 8 ,
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.Xr pam_securetty 8 ,
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.Xr pstat 8
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.Sh HISTORY
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A
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.Nm
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file appeared in
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.At v6 .
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