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GETTY(8)                    System Manager's Manual                   GETTY(8)



NAME
       getty  - set terminal mode

SYNOPSIS
       /etc/getty [ type ]

DESCRIPTION
       Getty  is  invoked  by  init(8) immediately after a terminal is opened,
       following the making of a connection.  While  reading  the  name  getty
       attempts  to  adapt  the system to the speed and type of terminal being
       used.

       Init calls getty with an argument specified by the ttys file entry  for
       the  terminal  line.   The argument can be used to make getty treat the
       line specially.  This argument is used as an index into the gettytab(5)
       database, to determine the characteristics of the line.  If there is no
       argument, or there is no such table, the default  table  is  used.   If
       there  is  no /etc/gettytab a set of system defaults is used.  If indi-
       cated by the table located, getty will clear the terminal screen, print
       a banner heading, and prompt for a login name.  Usually either the ban-
       ner of the login prompt will include the  system  hostname.   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 usually then changed and the
       `login:' is typed again; a second `break' changes the speed  again  and
       the  `login:'  is typed once more.  Successive `break' characters cycle
       through the some standard set of speeds.

       The user's name is terminated by a new-line or carriage-return  charac-
       ter.   The  latter  results  in  the system being set to treat carriage
       returns appropriately (see tty(4)).

       The user's name is scanned to see if it contains any lower-case  alpha-
       betic  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.

       Finally, login is called with the user's name as argument.

       Most  of the default actions of getty can be circumvented, or modified,
       by a suitable gettytab table.

       Getty can be set to timeout after some interval, which will cause  dial
       up  lines  to  hang  up  if  the  login  name is not entered reasonably
       quickly.

FILES
       /etc/gettytab

SEE ALSO
       gettytab(5), init(8), login(1), ioctl(2), tty(4), ttys(5).

BUGS
       Currently, the format of /etc/ttys limits the permitted table names  to
       a single character, this should be expanded.

       /etc/ttys should be replaced completely.



4th Berkeley Distribution        18 July 1983                         GETTY(8)