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getty - set typewriter mode
/etc/getty [ char ]
Getty is invoked by init(8) immediately after a typewriter is opened following a dial-up.
It reads the user's login name and calls login(1) with the name as argument. While read-
ing the name getty attempts to adapt the system to the speed and type of terminal being
Init calls getty with a single character argument taken from the ttys(5) file entry for
the terminal line. This argument determines a sequence of line speeds through which getty
cycles, and also the `login:' greeting message, which can contain character sequences to
put various kinds of terminals in useful states.
The user's name is terminated by a new-line or carriage-return character. In the second
case CRMOD mode is set (see ioctl(2)).
The 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.
If the terminal's `break' key is depressed, getty cycles to the next speed appropriate to
the type of line and prints the greeting message again.
Finally, login is called with the user's name as argument.
The following arguments from the ttys file are understood.
0 Cycles through 300-1200-150-110 baud. Useful as a default for dialup lines
accessed by a variety of terminals.
- Intended for an on-line Teletype model 33, for example an operator's console.
1 Optimized for a 150-baud Teletype model 37.
2 Intended for an on-line 9600-baud terminal, for example the Textronix 4104.
3 Starts at 1200 baud, cycles to 300 and back. Useful with 212 datasets where most
terminals run at 1200 speed.
5 Same as `3' but starts at 300.
4 Useful for on-line console DECwriter (LA36).
init(8), login(1), ioctl(2), ttys(5)
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