TTYS(5)TTYS(5)NAMEttys - terminal initialization data
DESCRIPTION
The ttys file 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 file. Fields are
separated by tabs and/or spaces. Some fields may contain more than one
word and should be enclosed in double quotes. Blank lines and comments
can appear anywhere in the file; comments are delimited by `#' and new
line. Unspecified fields default to null.
The first field is the terminal's entry in the device directory, /dev.
The second field of the file is the command to execute for the line,
typically getty(8), which performs such tasks as baud-rate recognition,
reading the login name, and calling login(1). 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. It's an error to specify a command instead of `none' for a
pseudo-tty such as ttyp0.
The third field is the type of terminal normally connected to that tty
line, as found in the termcap(5) data base file.
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. As flag values, the strings `on' and
`off' specify whether or not init should execute the command given in
the second field (it's an error to specify `on' if the second field
contains the string `none' rather than a command). The string `secure'
in addition to `on' allows root to login on this line. These flag
fields should not be quoted.
The string `window=' is followed by a quoted command string which init
will execute before starting getty. If the line ends in a comment, the
comment is included in the ty_comment field of the ttyent structure.
Some examples:
console "/etc/getty std.1200" vt100 on secure
ttyd0 "/etc/getty d1200" dialup on # 555-1234
ttyh0 "/etc/getty std.9600" hp2621-nl on # 254MC
ttyh1 "/etc/getty std.9600" plugboard on # John's office
ttyp0 none network
ttyp1 none network
ttyv0 "/usr/new/xterm -L :0" vs100 on window="/usr/new/Xvs100 0"
The first example permits root login on the console at 1200 baud, the
second allows dialup at 1200 baud without root login, the third and
fourth allow login at 9600 baud with terminal types of "hp2621-nl" and
"plugboard" respectively, the fifth and sixth line are examples of
network pseudo ttys, which should not have getty enabled on them, and
the last example shows a terminal emulator and window system startup
entry.
FILES
/etc/ttys
SEE ALSOlogin(1), getttyent(3), gettytab(5), init(8), getty(8)7th Edition May 20, 1986 TTYS(5)