1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" " 28.Dd July 21, 2020 29.Dt GETTY 8 30.Os 31.Sh NAME 32.Nm getty 33.Nd set terminal mode 34.Sh SYNOPSIS 35.Nm 36.Oo 37.Ar type 38.Op Ar tty 39.Oc 40.Sh DESCRIPTION 41The 42.Nm 43utility is called by 44.Xr init 8 45to open and initialize the tty line, read a login name, and invoke 46.Xr login 1 . 47.Pp 48The argument 49.Ar tty 50is the special device file in 51.Pa /dev 52to open for the terminal (for example, ``ttyh0''). 53If there is no argument or the argument is 54.Sq Fl , 55the tty line is assumed to be open as file descriptor 0. 56.Pp 57The 58.Ar type 59argument can be used to make 60.Nm 61treat the terminal line specially. 62This argument is used as an index into the 63.Xr gettytab 5 64database, to determine the characteristics of the line. 65If there is no argument, or there is no such table, the 66.Em default 67table is used. 68If there is no 69.Pa /etc/gettytab 70a set of system defaults is used. 71If indicated by the table located, 72.Nm 73will clear the terminal screen, 74print a banner heading, 75and prompt for a login name. 76Usually either the banner or the login prompt will include 77the system hostname. 78.Pp 79Most of the default actions of 80.Nm 81can be circumvented, or modified, by a suitable 82.Pa gettytab 83table. 84.Pp 85The 86.Nm 87utility can be set to timeout after some interval, 88which will cause dial up lines to hang up 89if the login name is not entered reasonably quickly. 90.Sh FILES 91.Bl -tag -width /etc/gettytab -compact 92.It Pa /etc/gettytab 93.It Pa /etc/ttys 94.El 95.Sh DIAGNOSTICS 96.Bl -diag 97.It "ttyxx: No such device or address." 98.It "ttyxx: No such file or address." 99.Pp 100A terminal which is turned 101on in the 102.Pa ttys 103file cannot be opened, likely because the requisite 104lines are either not configured into the system, the associated device 105was not attached during boot-time system configuration, 106or the special file in 107.Pa /dev 108does not exist. 109.El 110.Sh SEE ALSO 111.Xr login 1 , 112.Xr ioctl 2 , 113.Xr tty 4 , 114.Xr gettytab 5 , 115.Xr ttys 5 , 116.Xr init 8 , 117.Xr pstat 8 118.Sh HISTORY 119A 120.Nm 121utility appeared in 122.At v3 . 123