1.\" Copyright (c) 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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)nologin.8 8.1 (Berkeley) 6/19/93 33.\" $FreeBSD: src/sbin/nologin/nologin.5,v 1.7.2.4 2001/12/14 15:17:53 ru Exp $ 34.\" $DragonFly: src/sbin/nologin/nologin.5,v 1.2 2003/06/17 04:27:34 dillon Exp $ 35.\" 36.Dd June 19, 1993 37.Dt NOLOGIN 5 38.Os 39.Sh NAME 40.Nm nologin 41.Nd disallow logins 42.Sh DESCRIPTION 43Programs such as 44.Xr login 1 45disallow logins if the file 46.Pa /var/run/nologin 47exists. 48Programs display the contents of 49.Pa /var/run/nologin 50to the user and exit. 51This makes it simple to temporarily prevent incoming logins systemwide. 52.Pp 53To disable logins on a per-account basis, 54investigate 55.Xr nologin 8 . 56.Sh SECURITY 57Ignored by 58.Xr login 1 59for user root. 60.Sh FILES 61.Bl -tag -width /var/run/nologinxxx -compact 62.It Pa /var/run/nologin 63The 64.Nm 65file resides in 66.Pa /var/run . 67.El 68.Sh SEE ALSO 69.Xr login 1 , 70.Xr rlogin 1 , 71.Xr telnet 1 , 72.Xr nologin 8 , 73.Xr shutdown 8 74