GETTY(VII)                   9/19/73                   GETTY(VII)


     getty  - set typewriter mode




     Getty  is  invoked  by  init  (VII)  immediately   after   a

     typewriter  is opened following a dial-up.  The user's login

     name is read and the login(I) command is  called  with  this

     name as an argument.  While reading this name getty attempts

     to adapt the system to the speed and type of terminal  being


     Getty initially sets the speed of the interface to 150 baud,

     specifies  that  raw  mode  is  to  be  used (break on every

     character), that echo is to be suppressed, and either parity

     allowed.   It  types  the ``login:'' message (which includes

     the characters which  put  the  37  Teletype  terminal  into

     full-duplex  and unlock its keyboard).  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  then

     changed  to 300 baud and the ``login:'' is typed again, this

     time with the appropriate sequence which puts a GE  TermiNet

     300  into full-duplex.  This sequence is acceptable to other

     300 baud terminals also.  If a subsequent null character  is

     received, the speed is changed back to 150 baud.

     The user's name is terminated by  a  new-line  or  carriage-

     return  character.   The  latter results in the system being

     set  to  to  treat  carriage  returns   appropriately   (see


     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

     characters  into  the  corresponding  lower-case characters.

     Thus UNIX is usable from upper-case-only terminals.

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


     init(VII), login(I), stty(II)