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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 control the use of terminal special files. This informa- tion 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 asso- ciated command is not related to a tty. The second field of the file is the command to execute for the line, usu- ally 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 sys- tem terminal emulator or some other daemon process, and can contain mul- tiple 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 envi- ronment 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 termi- nal line, optionally determine the type of tty (whether dialin, 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 selec- tively allow or deny access or enable or disable accounting facilities for ttys as a group. As flag values, the strings ``on'' and ``off'' specify that init(8) 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 flag ``dialin'' indicates that a tty entry de- scribes a dialin line, and ``network'' indicates that a tty entry pro- vides a network connection. Either of these strings may also be speci- fied 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 al- phanumeric 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 facili- ties. 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 glob- bing 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 # 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/local/bin/xterm -display :0" xterm on window="/usr/local/bin/X :0" # Network pseudo ttys -- don't enable getty ttyp0 none network group=pty ttyp1 none network off group=pty SEE ALSO login(1), getttyent(3), ttyslot(3), gettytab(5), login.conf(5), termcap(5), getty(8), init(8) HISTORY A ttys file appeared in Version 6 AT&T UNIX. BSD May 27, 2005 BSD
NAME | DESCRIPTION | FILES | EXAMPLES | SEE ALSO | HISTORY
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