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TTYS(5)                     BSD File Formats Manual                    TTYS(5)

NAME
     ttys -- terminal initialization information

DESCRIPTION
     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 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))
     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 log in
              on this line.  If set for the console entry, then init(8) will
              start a single-user shell without asking for the superuser pass-
              word.

     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.

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      # 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

SEE ALSO
     login(1), getttyent(3), ttyslot(3), gettytab(5), termcap(5), getty(8),
     init(8), ttyflags(8)

HISTORY
     A ttys file appeared in Version 6 AT&T UNIX.

BSD                            October 22, 2008                            BSD