TTYS(5) BSD Reference Manual TTYS(5)
ttys - terminal initialization information
The ttys file 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 newlines. Any unspecified fields will default to null. The first field is the name of the terminal special file as it is found in /dev. 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) database file. The en- vironment 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)) or specify a window system process that init(8) will maintain for the terminal line. The following is a list of permitted flags for each TTY: on Specify that init(8) should execute the command given in the second field. off The opposite of on. secure If on is also specified, allows users with a UID of 0 to login on this line. Additionally, the following flags modify the default behavior of the ter- minal line. Some of these flags may not be supported by a terminal line driver. The flag fields should not be quoted. local Treat the line as if it is locally connected. rtscts Use RTS/CTS hardware flow control, if possible. mdmbuf Use DTR/DCD flow control if possible. softcar Ignore hardware carrier on the line. 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.
# 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 # 555-1234 # Mike's terminal: hp2621 ttyh0 "/usr/libexec/getty std.9600" hp2621-nl on # 457 Evans # John's terminal: vt100 ttyh1 "/usr/libexec/getty std.9600" vt100 on # 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 ttyp1 none network off
login(1), getttyent(3), ttyslot(3), gettytab(5), termcap(5), getty(8), init(8), ttyflags(8)
A ttys file appeared in Version 6 AT&T UNIX. MirOS BSD #10-current June 4, 1993 1
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