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authorBruce Dubbs <bdubbs@linuxfromscratch.org>2020-06-16 11:56:28 +0000
committerBruce Dubbs <bdubbs@linuxfromscratch.org>2020-06-16 11:56:28 +0000
commit675606bde2ba53946537b42a5aa576692a311621 (patch)
treeaf20c20ce3841c16b24d0b9903af6878a4a0f5a6 /chapter09/etcshells.xml
parent560065f976e371779928dbf8b9428217f3f57331 (diff)
parent1cd59612d00603c9ce773ad821a15d20bc4fa0b7 (diff)
Split Chapter 5 into three separate chapters.
Implement a new method of cross-building the LFS tool chain and other tools to simplify the method of isolating the new system from the original host. This will be the start of LFS-10.0. Move old trunk/BOOK to branches/old-trunk. git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11946 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE part PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
+ <!ENTITY % general-entities SYSTEM "../general.ent">
+ %general-entities;
+]>
+
+<sect1 id="ch-config-shells" xreflabel="Creating the /etc/shells File">
+ <?dbhtml filename="etcshells.html"?>
+
+<!--
+ <sect1info>
+ <othername>$LastChangedBy$</othername>
+ <date>$Date$</date>
+ </sect1info>
+-->
+ <title>Creating the /etc/shells File</title>
+
+ <indexterm zone="ch-config-shells">
+ <primary sortas="e-etc-shells">/etc/shells</primary>
+ </indexterm>
+
+ <para>The <filename>shells</filename> file contains a list of
+ login shells on the system. Applications use this file to determine
+ whether a shell is valid. For each shell a single line should be
+ present, consisting of the shell's path relative to the root of the
+ directory structure (/).</para>
+
+ <para>For example, this file is consulted by <command>chsh</command>
+ to determine whether an unprivileged user may change the login shell for her
+ own account. If the command name is not listed, the user will be denied the
+ ability to change shells.</para>
+
+ <para>It is a requirement for applications such as
+ <application>GDM</application> which does not populate the
+ face browser if it can't find <filename>/etc/shells</filename>, or
+ FTP daemons which traditionally disallow access to users
+ with shells not included in this file.</para>
+
+<screen role="root"><userinput>cat &gt; /etc/shells &lt;&lt; "EOF"
+<literal># Begin /etc/shells
+
+/bin/sh
+/bin/bash
+
+# End /etc/shells</literal>
+EOF</userinput></screen>
+
+</sect1>