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28 .\" from: @(#)ttys.5 8.1 (Berkeley) 6/4/93
29 .\" $FreeBSD: head/libexec/getty/ttys.5 330277 2018-03-02 14:16:19Z trasz $
31 .Dd September 20, 2023
36 .Nd terminal initialization information
40 contains information that is used by various routines to initialize
41 and control the use of terminal special files.
42 This information is read with the
45 There is one line in the
47 file per special device file.
48 Fields are separated by tabs and/or spaces.
49 Fields comprised of more than one word should be enclosed in
52 Blank lines and comments may appear anywhere in the file;
53 comments are delimited by hash marks
56 Any unspecified fields will default to null.
58 The first field is normally the
59 name of the terminal special file as it is found in
61 However, it can be any arbitrary string
62 when the associated command is not related to a tty.
64 The second field of the file is the command to execute for the line,
67 which initializes and opens the line, setting the speed, waiting for
68 a user name and executing the
71 It can be, however, any desired command, for example
72 the start up for a window system terminal emulator or some other
73 daemon process, and can contain multiple words if quoted.
75 The third field is the type of terminal usually connected to that
76 tty line, normally the one found in the
79 The environment variable
81 is initialized with the value by
87 The remaining fields set flags in the
91 specify a window system process that
93 will maintain for the terminal line, optionally determine the
94 type of tty (whether dialup, network or otherwise),
95 or specify a tty group
96 name that allows the login class database (see
98 to refer to many ttys as a group, to selectively allow or
99 deny access or enable or disable accounting facilities for
102 The following flag values are supported:
103 .Bl -tag -width "ifconsole" -offset indent
105 Enable the tty entry so that
107 should execute the command given in the second field.
109 Disable the tty entry.
111 Disable the tty entry if it is not the console.
112 That is, you can construct a tty entry with both this flag and the
114 flag to make it only active if that tty is the console.
116 Disable the tty entry if it doesn't exist.
120 flag is specified, this flag allows users with a uid of 0
121 to login on this line.
123 Indicate that the tty entry describes a dialup line.
125 Indicate that the tty entry provides a network connection.
128 Either of these flag values may also be specified in the
133 may be followed by a quoted command string which
137 starting the command specified by the second field.
141 may be followed by a group name comprised of
142 alphanumeric characters that can be used by
144 to refer to many tty lines as a group to enable or disable access
145 and accounting facilities.
146 If no group is specified, then the tty becomes a member of the group
148 For backwards compatibility, the
150 should appear last on the line, immediately before the optional comment.
152 Both the second field and any command specified with
154 will be split into words and executed using
156 Words are separated by any combinations of tabs and spaces.
157 Arguments containing whitespace should be enclosed in single quotes
159 Note that no shell-style globbing or other variable substitution occurs.
161 .Bl -tag -width /etc/ttys -compact
166 # root login on console at 1200 baud
167 console "/usr/libexec/getty std.1200" vt100 on secure
168 # dialup at 1200 baud, no root logins
169 ttyd0 "/usr/libexec/getty d1200" dialup on group=dialup # 555-1234
170 # dialup at 115200 baud, enable only if it's the console
171 ttyd1 "/usr/libexec/getty std.115200" dialup on secure ifconsole
172 # Mike's terminal: hp2621
173 ttyh0 "/usr/libexec/getty std.115200" hp2621-nl on group=dialup # 457 Evans
174 # John's terminal: vt100
175 ttyh1 "/usr/libexec/getty std.115200" vt100 on group=dialup # 459 Evans
176 # terminal emulate/window system
177 ttyv0 "/usr/local/bin/xterm -display :0" xterm on window="/usr/local/bin/X :0"
178 # enable the video tty only if it exists
179 ttyv1 "/usr/libexec/getty Pc" cons25 on secure ifexists
180 # Network pseudo ttys -- don't enable getty
181 ttyp0 none network group=pty
182 ttyp1 none network off group=pty