man(1) Manual page archive

     GETTY(8)                                                 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 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

          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, getty 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 ttys file are understood.

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

          -    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, for example
               the Textronix 4104.

          3    Starts at 1200 baud, cycles to 300 and back.  Useful

     GETTY(8)                                                 GETTY(8)

               with 212 datasets where most terminals run at 1200

          5    Same as `3' but starts at 300.

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

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