getty(1M) DG/UX R4.11MU05 getty(1M)
NAME
getty - set terminal type, modes, speed, and line discipline
SYNOPSIS
/usr/sbin/getty [ -h ] [ -t timeout ] line [ speed [ type [ linedisc
] ] ]
where:
timeout A login time limit in seconds.
line A TTY device file in the /dev directory.
speed The label of an entry in the /etc/ttydefs file.
type A value for the TERM variable (obsolete).
linedisc The initial line discipline (obsolete).
DESCRIPTION
getty is a symbolic link to /usr/lib/saf/ttymon. It is included for
compatibility with previous releases for the few applications that
still call getty directly. getty can be executed only by a process
with the user ID of 0.
Initially, getty generates a system identification message from the
values returned by the uname(2) system call. Then, if /etc/issue
exists, getty outputs the file's contents to the user's terminal,
followed finally by the login prompt. getty then reads the user's
login name and invokes the login(1) command with the user's name as
its argument.
Initially, getty attempts to adapt the system to the terminal speed
by using the options and arguments specified on the command line.
Subsequently, as getty reads the user's name a character at a time,
it attempts to customize the speed setting. If a null character (or
framing error) is received, it is assumed to be the result of the
user pressing the BREAK key. This will cause getty to attempt the
next speed in the series. The series that getty tries is determined
by the ``hunt groups'' it finds in /etc/ttydefs [see ttydefs(4)].
The only required argument is line, the name of a TTY line in /dev to
which getty is to attach itself. getty uses this string as the name
of a file in the /dev directory to open for reading and writing.
Options are:
-h specify that no hangup should occur. If the -h flag is not
set, a hangup will be forced by setting the TTY port speed
to zero before setting the speed to the default or
specified speed.
-t timeout
specify that getty should exit if the open on the line
succeeds and no one types a user name on the line within
timeout seconds.
speed The optional second argument is a label to a speed and TTY
definition in the file /etc/ttydefs. This definition tells
getty at what speed to run initially, what the initial TTY
settings are, and what speed to try next should the user
indicate (by pressing the BREAK key) that the speed is
inappropriate. The default speed is 300 baud.
type This argument is obsolete and will be ignored. (In
releases of the DG/UX System prior to Revision 5.4, the
optional third argument was a character string that was
assigned to the TERM variable and exported.)
linedisc This argument is obsolete and will be ignored. (In
releases of the DG/UX System prior to Revision 5.4, the
optional fourth argument was a character string describing
which line discipline to use in communicating with the
terminal.)
When given no optional arguments, getty specifies the following: the
speed of the interface is set to 300 baud, any parity is allowed,
new-line characters are converted to carriage return and line feed,
and tab expansion is performed on the standard output.
FILES
/etc/ttydefs TTY definitions file
/etc/issue System identification message file
SEE ALSO
ct(1), login(1), init(1M), sttydefs(1M), ttymon(1M), uname(2),
inittab(4), ttydefs(4), termio(7), ttcompat(7).
NOTE
The following ``check option'' invocation of getty, provided in
releases of the DG/UX System prior to Revision 5.4, is obsolete and
no longer supported:
/usr/sbin/getty -c file
Instead use the following command to list the contents of the
/etc/ttydefs file and perform a validity check on the file:
sttydefs -l
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