BSD 2.11 - man page for getty (bsd section 8)

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GETTY(8)										 GETTY(8)

NAME
       getty  - set terminal mode

SYNOPSIS
       getty [ type [ tty ] ]

DESCRIPTION
       Getty  is  usually  invoked  by	init(8) to open and initialize the tty line, read a login
       name, and invoke login(1).  getty attempts to adapt the system to the speed  and  type  of
       terminal being used.

       The  argument  tty  is  the  special  device  file in /dev to open for the terminal (e.g.,
       ``ttyh0'').  If there is no argument or the argument is ``-'', the tty line is assumed  to
       be open as file descriptor 0.

       The type argument can be used to make getty treat the terminal line specially.  This argu-
       ment 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 indicated by the
       table  located,	getty  will clear the terminal screen, print a banner heading, and prompt
       for a login name.  Usually either the banner 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'  charac-
       ters cycle through the same standard set of speeds.

       The  user's  name  is  terminated  by a new-line or carriage-return character.  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 alphabetic characters;  if
       not,  and if the name is nonempty, the system is told to map any future upper-case charac-
       ters into the corresponding lower-case characters.

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

       Most of the default actions of getty can be circumvented, or modified, by a suitable  get-
       tytab 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.

DIAGNOSTICS
       ttyxx: No such device or address.  ttyxx: No such file or address.  A  terminal	which  is
       turned on in the ttys file cannot be opened, likely because the requisite lines are either
       not configured into the system, the associated device was not  attached	during	boot-time
       system configuration, or the special file in /dev does not exist.

FILES
       /etc/gettytab

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

4th Berkeley Distribution		November 17, 1996				 GETTY(8)
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