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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 of
change.</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 > /etc/shells << "EOF"
<literal># Begin /etc/shells
/bin/sh
/bin/bash
# End /etc/shells</literal>
EOF</userinput></screen>
</sect1>
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