source: chapter09/etcshells.xml

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Last change on this file was 52dcb7d, checked in by Xℹ Ruoyao <xry111@…>, 10 months ago

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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 <title>Creating the /etc/shells File</title>
12
13 <indexterm zone="ch-config-shells">
14 <primary sortas="e-etc-shells">/etc/shells</primary>
15 </indexterm>
16
17 <para>The <filename>shells</filename> file contains a list of
18 login shells on the system. Applications use this file to determine
19 whether a shell is valid. For each shell a single line should be
20 present, consisting of the shell's path relative to the root of the
21 directory structure (/).</para>
22
23 <para>For example, this file is consulted by <command>chsh</command>
24 to determine whether an unprivileged user may change the login shell for her
25 own account. If the command name is not listed, the user will be denied the
26 ability to change shells.</para>
27
28 <para>It is a requirement for applications such as
29 <application>GDM</application> which does not populate the
30 face browser if it can't find <filename>/etc/shells</filename>, or
31 FTP daemons which traditionally disallow access to users
32 with shells not included in this file.</para>
33
34<screen role="root"><userinput>cat &gt; /etc/shells &lt;&lt; "EOF"
35<literal># Begin /etc/shells
36
37/bin/sh
38/bin/bash
39
40# End /etc/shells</literal>
41EOF</userinput></screen>
42
43</sect1>
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