[unix-history] / man / man7 / getty.7

.th GETTY VII 9/19/73
.sh NAME
getty  \*- set typewriter mode
.sh SYNOPSIS
.bd /etc/getty
.sh DESCRIPTION
.it Getty
is invoked
by
.it "init (VII)"
immediately after a typewriter is opened
following a dial-up.
The user's login name is read and the login(I) command
is called with this name as an argument.
While reading this name
.it getty
attempts to adapt the system to the speed and type of terminal
being used.
.s3
.it Getty
initially sets the speed of the interface to 150 baud,
specifies that raw mode is to be used (break on every character),
that echo is to be suppressed, and either parity
allowed.
It types the ``login:'' message
(which includes the characters which put the 37 Teletype
terminal into full-duplex and unlock its keyboard).
Then the user's name is read, a character at a time.
If a null character is received, it is assumed to be the result
of the user pushing the ``break'' (``interrupt'') key.
The speed is then
changed to 300 baud and the ``login:'' is typed again,
this time with the appropriate
sequence which puts a GE TermiNet 300 into full-duplex.
This sequence is acceptable to other 300 baud terminals also.
If a subsequent null character is received,
the speed is changed back to 150 baud.
.s3
The user's name is terminated by a new-line or
carriage-return character.
The latter results in the system being set to
to treat carriage returns appropriately (see stty(II)).
.s3
The user's name is scanned to see if
it contains any lower-case alphabetic characters; if not,
and if the name is nonempty, the
system is told to map any future upper-case characters
into the corresponding lower-case characters.
Thus UNIX is usable from upper-case-only terminals.
.s3
Finally, login is called with the user's name as argument.
.sh "SEE ALSO"
init(VII), login(I), stty(II)
Commit	Line	Data
cab0468e DR	1	.th GETTY VII 9/19/73
	2	.sh NAME
	3	getty \*- set typewriter mode
	4	.sh SYNOPSIS
	5	.bd /etc/getty
	6	.sh DESCRIPTION
	7	.it Getty
	8	is invoked
	9	by
	10	.it "init (VII)"
	11	immediately after a typewriter is opened
	12	following a dial-up.
	13	The user's login name is read and the login(I) command
	14	is called with this name as an argument.
	15	While reading this name
	16	.it getty
	17	attempts to adapt the system to the speed and type of terminal
	18	being used.
	19	.s3
	20	.it Getty
	21	initially sets the speed of the interface to 150 baud,
	22	specifies that raw mode is to be used (break on every character),
	23	that echo is to be suppressed, and either parity
	24	allowed.
	25	It types the ``login:'' message
	26	(which includes the characters which put the 37 Teletype
	27	terminal into full-duplex and unlock its keyboard).
	28	Then the user's name is read, a character at a time.
	29	If a null character is received, it is assumed to be the result
	30	of the user pushing the ``break'' (``interrupt'') key.
	31	The speed is then
	32	changed to 300 baud and the ``login:'' is typed again,
	33	this time with the appropriate
	34	sequence which puts a GE TermiNet 300 into full-duplex.
	35	This sequence is acceptable to other 300 baud terminals also.
	36	If a subsequent null character is received,
	37	the speed is changed back to 150 baud.
	38	.s3
	39	The user's name is terminated by a new-line or
	40	carriage-return character.
	41	The latter results in the system being set to
	42	to treat carriage returns appropriately (see stty(II)).
	43	.s3
	44	The user's name is scanned to see if
	45	it contains any lower-case alphabetic characters; if not,
	46	and if the name is nonempty, the
	47	system is told to map any future upper-case characters
	48	into the corresponding lower-case characters.
	49	Thus UNIX is usable from upper-case-only terminals.
	50	.s3
	51	Finally, login is called with the user's name as argument.
	52	.sh "SEE ALSO"
	53	init(VII), login(I), stty(II)