1.\" $OpenBSD: shells.5,v 1.5 2000/02/29 04:48:39 aaron 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. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)shells.5 8.1 (Berkeley) 6/5/93 36.\" 37.Dd June 5, 1993 38.Dt SHELLS 5 39.Os 40.Sh NAME 41.Nm shells 42.Nd shell database 43.Sh DESCRIPTION 44The 45.Nm 46file contains a list of valid shells available on the system. 47A shell is a command line interpreter that reads user input and executes 48commands. 49For each shell a single line should be present, consisting of the 50shell's path, relative to root. 51.Pp 52A hash mark 53.Pq Sq # 54indicates the beginning of a comment; subsequent 55characters up to the end of the line are not interpreted by the 56routines which search the file. 57Blank lines are also ignored. 58.Pp 59The 60.Xr chpass 1 61program will not let regular users change their default shell to one not 62listed in the 63.Nm 64file. 65The 66.Xr ftpd 8 67daemon denies access to users who are not using one of the listed shells. 68.Sh FILES 69.Bl -tag -width /etc/shells -compact 70.It Pa /etc/shells 71.El 72.Sh SEE ALSO 73.Xr chpass 1 , 74.Xr getusershell 3 75.Sh HISTORY 76The 77.Nm 78file format appeared in 79.Bx 4.3 tahoe . 80