getty.tproj/getty.8

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  32 .\"     from: @(#)getty.8       8.1 (Berkeley) 6/4/93
  33 .\"     $Id: getty.8,v 1.1.1.1 1999/05/02 04:21:29 wsanchez Exp $
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  35 .Dd June 4, 1993
  36 .Dt GETTY 8
  37 .Os BSD 4
  38 .Sh NAME
  39 .Nm getty
  40 .Nd set terminal mode
  41 .Sh SYNOPSIS
  42 .Nm getty
  43 .Oo
  44 .Ar type
  45 .Op Ar tty
  46 .Oc
  47 .Sh DESCRIPTION
  48 The
  49 .Nm getty
  50 program
  51 is called by
  52 .Xr init 8
  53 to open and initialize the tty line, read a login name, and invoke
  54 .Xr login 1 .
  55 .Pp
  56 The argument
  57 .Ar tty
  58 is the special device file in
  59 .Pa /dev
  60 to open for the terminal (for example, ``ttyh0'').
  61 If there is no argument or the argument is
  62 .Ql Fl ,
  63 the tty line is assumed to be open as file descriptor 0.
  64 .Pp
  65 The
  66 .Ar type
  67 argument can be used to make
  68 .Nm getty
  69 treat the terminal line specially.
  70 This argument is used as an index into the
  71 .Nm gettytab 5
  72 database, to determine the characteristics of the line.
  73 If there is no argument, or there is no such table, the
  74 .Em default
  75 table is used.
  76 If there is no
  77 .Pa /etc/gettytab
  78 a set of system defaults is used.
  79 If indicated by the table located,
  80 .Nm getty
  81 will clear the terminal screen,
  82 print a banner heading,
  83 and prompt for a login name.
  84 Usually either the banner or the login prompt will include
  85 the system hostname.
  86 .Pp
  87 Most of the default actions of
  88 .Nm getty
  89 can be circumvented, or modified, by a suitable
  90 .Nm gettytab
  91 table.
  92 .Pp
  93 The
  94 .Nm getty
  95 program
  96 can be set to timeout after some interval,
  97 which will cause dial up lines to hang up
  98 if the login name is not entered reasonably quickly.
  99 .Sh DIAGNOSTICS
 100 .Bl -diag
 101 .It "ttyxx: No such device or address."
 102 .It "ttyxx: No such file or address."
 103 A terminal which is turned
 104 on in the
 105 .Xr ttys
 106 file cannot be opened, likely because the requisite
 107 lines are either not configured into the system, the associated device
 108 was not attached during boot-time system configuration,
 109 or the special file in
 110 .Pa /dev
 111 does not exist.
 112 .El
 113 .Sh FILES
 114 .Bl -tag -width /etc/gettytab -compact
 115 .It Pa /etc/gettytab
 116 .El
 117 .Sh SEE ALSO
 118 .Xr gettytab 5 ,
 119 .Xr init 8 ,
 120 .Xr login 1 ,
 121 .Xr ioctl 2 ,
 122 .Xr tty 4 ,
 123 .Xr ttys 5
 124 .Sh HISTORY
 125 A
 126 .Nm getty
 127 program appeared in
 128 .At v6 .