GETTY(8)            UNIX Programmer's Manual             GETTY(8)

NAME
     getty  - set typewriter mode

SYNOPSIS
     /etc/getty [ char ]

DESCRIPTION
     _G_e_t_t_y is invoked by _i_n_i_t(8) immediately after a typewriter
     is opened following a dial-up.  It prints the system banner,
     found in /_e_t_c/_i_d_e_n_t, then reads the user's login name and
     calls _l_o_g_i_n(1) with the name as argument.  While reading the
     name _g_e_t_t_y attempts to adapt the system to the speed and
     type of terminal being used.

     _I_n_i_t calls _g_e_t_t_y with a single character argument taken from
     the _t_t_y_s(5) file entry for the terminal line.  This argument
     determines a sequence of line speeds through which _g_e_t_t_y
     cycles, and also the `login:' greeting message, which can
     contain character sequences to put various kinds of termi-
     nals 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
     _i_o_c_t_l(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, _g_e_t_t_y 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 _t_t_y_s file are understood.

     0    Cycles through 300-1200-150-110 baud.  Useful as a
          default for dialup lines accessed by a variety of ter-
          minals.

     -    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.

     3    Starts at 1200 baud, cycles to 300 and back.  Useful
          with 212 datasets where most terminals run at 1200
          speed.

Printed 8/2/83                                                  1

GETTY(8)            UNIX Programmer's Manual             GETTY(8)

     4    Useful for on-line console DECwriter (LA36).

     5    Same as `3' but starts at 300.

     6    1200 baud.

     7    2400 baud.

     8    4800 baud.

     9    9600 baud.

     B    Adapt to terminal baud rate automatically.  The user is
          invited to type either a return or a control-C.  _G_e_t_t_y
          should guess the correct baud rate in one or two tries.

FILES
     /etc/ident          local system identification banner

SEE ALSO
     login(1), ioctl(2), ttys(5), init(8)

BUGS
     The ``B'' entry is optional.

Printed 8/2/83                                                  2