source: chapter09/etcshells.xml@ a3d0817

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Last change on this file since a3d0817 was a3d0817, checked in by Bruce Dubbs <bdubbs@…>, 18 months ago

Text updated for cross2 chapter 9

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/cross2@11928 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE part PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-config-shells" xreflabel="Creating the /etc/shells File">
9 <?dbhtml filename="etcshells.html"?>
10
11<!--
12 <sect1info>
13 <othername>$LastChangedBy$</othername>
14 <date>$Date$</date>
15 </sect1info>
16-->
17 <title>Creating the /etc/shells File</title>
18
19 <indexterm zone="ch-config-shells">
20 <primary sortas="e-etc-shells">/etc/shells</primary>
21 </indexterm>
22
23 <para>The <filename>shells</filename> file contains a list of
24 login shells on the system. Applications use this file to determine
25 whether a shell is valid. For each shell a single line should be
26 present, consisting of the shell's path relative to the root of the
27 directory structure (/).</para>
28
29 <para>For example, this file is consulted by <command>chsh</command>
30 to determine whether an unprivileged user may change the login shell for her
31 own account. If the command name is not listed, the user will be denied of
32 change.</para>
33
34 <para>It is a requirement for applications such as
35 <application>GDM</application> which does not populate the
36 face browser if it can't find <filename>/etc/shells</filename>, or
37 FTP daemons which traditionally disallow access to users
38 with shells not included in this file.</para>
39
40<screen role="root"><userinput>cat &gt; /etc/shells &lt;&lt; "EOF"
41<literal># Begin /etc/shells
42
43/bin/sh
44/bin/bash
45
46# End /etc/shells</literal>
47EOF</userinput></screen>
48
49</sect1>
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