DragonFly On-Line Manual Pages
TTYS(5) DragonFly 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 control 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 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
associated command is not related to a tty.
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. 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.
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)),
specify a window system process that init(8) will maintain for the
terminal line, optionally determine the type of tty (whether dialup,
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
selectively allow or deny access or enable or disable accounting
facilities for ttys as a group.
The following flag values are supported:
on Enable the tty entry so that init(8) should execute the
command given in the second field.
off Disable the tty entry.
ifconsole Disable the tty entry if it is not the console. That
is, you can construct a tty entry with both this flag
and the "on" flag to make it only active if that tty is
the console.
ifexists Disable the tty entry if it doesn't exist.
secure If the "on" flag is specified, this flag allows users
with a uid of 0 to login on this line.
dialup Indicate that the tty entry describes a dialup line.
network Indicate that the tty entry provides a network
connection.
Either of these flag values may also be specified 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
alphanumeric 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
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.
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
globbing or other variable substitution occurs.
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 group=dialup # 555-1234
# dialup at 115200 baud, enable only if it's the console
ttyd1 "/usr/libexec/getty std.115200" dialup on secure ifconsole
# Mike's terminal: hp2621
ttyh0 "/usr/libexec/getty std.115200" hp2621-nl on group=dialup # 457 Evans
# John's terminal: vt100
ttyh1 "/usr/libexec/getty std.115200" 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"
# enable the video tty only if it exists
ttyv1 "/usr/libexec/getty Pc" cons25 on secure ifexists
# Network pseudo ttys -- don't enable getty
ttyp0 none network group=pty
ttyp1 none network off group=pty
SEE ALSO
login(1), getttyent(3), gettytab(5), login.conf(5), termcap(5), getty(8),
init(8), pstat(8)
HISTORY
A ttys file appeared in Version 6 AT&T UNIX.
DragonFly 6.5-DEVELOPMENT September 20, 2023 DragonFly 6.5-DEVELOPMENT