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.\" from: @(#)getty.8 8.1 (Berkeley) 6/4/93 29.\" " 30.Dd July 21, 2020 31.Dt GETTY 8 32.Os 33.Sh NAME 34.Nm getty 35.Nd set terminal mode 36.Sh SYNOPSIS 37.Nm 38.Oo 39.Ar type 40.Op Ar tty 41.Oc 42.Sh DESCRIPTION 43The 44.Nm 45utility is called by 46.Xr init 8 47to open and initialize the tty line, read a login name, and invoke 48.Xr login 1 . 49.Pp 50The argument 51.Ar tty 52is the special device file in 53.Pa /dev 54to open for the terminal (for example, ``ttyh0''). 55If there is no argument or the argument is 56.Sq Fl , 57the tty line is assumed to be open as file descriptor 0. 58.Pp 59The 60.Ar type 61argument can be used to make 62.Nm 63treat the terminal line specially. 64This argument is used as an index into the 65.Xr gettytab 5 66database, to determine the characteristics of the line. 67If there is no argument, or there is no such table, the 68.Em default 69table is used. 70If there is no 71.Pa /etc/gettytab 72a set of system defaults is used. 73If indicated by the table located, 74.Nm 75will clear the terminal screen, 76print a banner heading, 77and prompt for a login name. 78Usually either the banner or the login prompt will include 79the system hostname. 80.Pp 81Most of the default actions of 82.Nm 83can be circumvented, or modified, by a suitable 84.Pa gettytab 85table. 86.Pp 87The 88.Nm 89utility can be set to timeout after some interval, 90which will cause dial up lines to hang up 91if the login name is not entered reasonably quickly. 92.Sh FILES 93.Bl -tag -width /etc/gettytab -compact 94.It Pa /etc/gettytab 95.It Pa /etc/ttys 96.El 97.Sh DIAGNOSTICS 98.Bl -diag 99.It "ttyxx: No such device or address." 100.It "ttyxx: No such file or address." 101.Pp 102A terminal which is turned 103on in the 104.Pa ttys 105file cannot be opened, likely because the requisite 106lines are either not configured into the system, the associated device 107was not attached during boot-time system configuration, 108or the special file in 109.Pa /dev 110does not exist. 111.El 112.Sh SEE ALSO 113.Xr login 1 , 114.Xr ioctl 2 , 115.Xr tty 4 , 116.Xr gettytab 5 , 117.Xr ttys 5 , 118.Xr init 8 , 119.Xr pstat 8 120.Sh HISTORY 121A 122.Nm 123utility appeared in 124.At v3 . 125