[1fa2099] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE part PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-config-shells" xreflabel="Creating the /etc/shells File">
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| 9 | <?dbhtml filename="etcshells.html"?>
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| 10 |
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| 11 | <!--
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| 12 | <sect1info>
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[37e35d2] | 13 | <othername>$LastChangedBy: renodr $</othername>
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| 14 | <date>$Date: 2020-06-12 23:04:48 +0200 (Fr, 12. Jun 2020) $</date>
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[1fa2099] | 15 | </sect1info>
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| 16 | -->
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| 17 | <title>Creating the /etc/shells File</title>
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| 18 |
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| 19 | <indexterm zone="ch-config-shells">
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| 20 | <primary sortas="e-etc-shells">/etc/shells</primary>
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| 21 | </indexterm>
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| 22 |
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| 23 | <para>The <filename>shells</filename> file contains a list of
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| 24 | login shells on the system. Applications use this file to determine
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| 25 | whether a shell is valid. For each shell a single line should be
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[37e35d2] | 26 | present, consisting of the shell's path relative to the root of the
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[1fa2099] | 27 | directory structure (/).</para>
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| 28 |
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| 29 | <para>For example, this file is consulted by <command>chsh</command>
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| 30 | to determine whether an unprivileged user may change the login shell for her
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[37e35d2] | 31 | own account. If the command name is not listed, the user will be denied the
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| 32 | ability to change shells.</para>
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[1fa2099] | 33 |
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| 34 | <para>It is a requirement for applications such as
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| 35 | <application>GDM</application> which does not populate the
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| 36 | face browser if it can't find <filename>/etc/shells</filename>, or
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| 37 | FTP daemons which traditionally disallow access to users
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| 38 | with shells not included in this file.</para>
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| 39 |
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| 40 | <screen role="root"><userinput>cat > /etc/shells << "EOF"
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| 41 | <literal># Begin /etc/shells
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| 42 |
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| 43 | /bin/sh
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| 44 | /bin/bash
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| 45 |
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| 46 | # End /etc/shells</literal>
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| 47 | EOF</userinput></screen>
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| 48 |
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| 49 | </sect1>
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