GETTY(8) System Manager's Manual GETTY(8)
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 reading the name getty attempts to
adapt the system to the speed and type of terminal being used.
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 charac-
ter. 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
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
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 opera-
1 Optimized for a 150-baud Teletype model 37.
2 Intended for an on-line 9600-baud terminal, for example the Tex-
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)