1.\" $NetBSD: nologin.5,v 1.2 2008/05/02 19:09:56 martin Exp $ 2.\" 3.\" Copyright (c) 2005 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This document is derived from works contributed to The NetBSD Foundation 7.\" by Brian Ginsbach. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd December 9, 2005 31.Dt NOLOGIN 5 32.Os 33.Sh NAME 34.Nm nologin 35.Nd file disallowing and containing reason for disallowing logins 36.Sh DESCRIPTION 37The file 38.Pa /etc/nologin , 39if it exists, causes the login procedure, used by programs such as 40.Xr login 1 , 41to terminate. 42The program may display the contents of 43.Pa /etc/nologin 44to the user before exiting. 45.Pp 46This file is a simple mechanism to temporarily prevent incoming logins. 47As such, 48the file 49.Pa /etc/nologin 50is created by 51.Xr shutdown 8 52five minutes before system shutdown, 53or immediately if shutdown is in less than five minutes. 54The file 55.Pa /etc/nologin 56is removed just before 57.Xr shutdown 8 58exits. 59.Pp 60To disable logins on a per-account basis, 61see 62.Xr nologin 8 . 63.Pp 64The file 65.Pa /etc/nologin 66has no affect on the login procedure for the root user. 67.Sh FILES 68.Bl -tag -width /etc/nologin -compact 69.It Pa /etc/nologin 70The 71.Nm 72file resides in 73.Pa /etc . 74.El 75.Sh EXAMPLES 76.Bd -literal 77NO LOGINS: System going down at 18:22 78.Ed 79.Sh SEE ALSO 80.Xr login 1 , 81.Xr ftpd 8 , 82.Xr nologin 8 , 83.Xr rshd 8 , 84.Xr shutdown 8 , 85.Xr sshd 8 86