1.\" $OpenBSD: shells.5,v 1.8 2007/05/31 19:19:58 jmc Exp $ 2.\" $NetBSD: shells.5,v 1.3 1994/11/30 19:31:32 jtc Exp $ 3.\" 4.\" Copyright (c) 1986, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)shells.5 8.1 (Berkeley) 6/5/93 32.\" 33.Dd $Mdocdate: May 31 2007 $ 34.Dt SHELLS 5 35.Os 36.Sh NAME 37.Nm shells 38.Nd shell database 39.Sh DESCRIPTION 40The 41.Nm 42file contains a list of valid shells available on the system. 43A shell is a command line interpreter that reads user input and executes 44commands. 45For each shell a single line should be present, consisting of the 46shell's path, relative to root. 47.Pp 48A hash mark 49.Pq Sq # 50indicates the beginning of a comment; subsequent 51characters up to the end of the line are not interpreted by the 52routines which search the file. 53Blank lines are also ignored. 54.Pp 55The 56.Xr chpass 1 57program will not let regular users change their default shell to one not 58listed in the 59.Nm 60file. 61The 62.Xr ftpd 8 63daemon denies access to users who are not using one of the listed shells. 64.Sh FILES 65.Bl -tag -width /etc/shells -compact 66.It Pa /etc/shells 67.El 68.Sh SEE ALSO 69.Xr chpass 1 , 70.Xr login 1 , 71.Xr getusershell 3 , 72.Xr nologin 8 73.Sh HISTORY 74The 75.Nm 76file format appeared in 77.Bx 4.3 tahoe . 78