1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.4/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-system-shadow" role="wrap">
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9 | <?dbhtml filename="shadow.html"?>
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10 |
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11 | <title>Shadow-&shadow-version;</title>
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12 |
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13 | <indexterm zone="ch-system-shadow">
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14 | <primary sortas="a-Shadow">Shadow</primary>
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15 | </indexterm>
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16 |
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17 | <sect2 role="package">
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18 | <title/>
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19 |
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20 | <para>The Shadow package contains programs for handling passwords in a
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21 | secure way.</para>
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22 |
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23 | </sect2>
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24 |
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25 | <sect2 role="installation">
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26 | <title>Installation of Shadow</title>
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27 |
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28 | <note os="a">
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29 | <para>If you would like to enforce the use of strong passwords,
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30 | refer to <ulink url="&blfs-root;view/svn/postlfs/cracklib.html"/>
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31 | for installing Cracklib prior to building Shadow. Then add
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32 | <parameter>--with-libcrack</parameter> to the <command>configure</command>
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33 | command below.</para>
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34 | </note>
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35 |
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36 | <para os="p1">The following patch fixes an issue in useradd, where it only
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37 | accepts group names, not group id numbers:</para>
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38 |
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39 | <screen os="p2"><userinput>patch -Np1 -i ../&shadow-useradd_fix-patch;</userinput></screen>
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40 |
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41 | <para os="b">Create a config.cache containing information about a test that
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42 | cannot be run when cross-compiling:</para>
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43 |
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44 | <screen os="c"><userinput>echo "ac_cv_func_setpgrp_void=yes" > config.cache</userinput></screen>
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45 |
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46 | <para os="d">Prepare Shadow for compilation:</para>
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47 |
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48 | <screen os="e"><userinput>./configure --build=${CLFS_HOST} --host=${CLFS_TARGET} \
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49 | --libdir=/lib --sysconfdir=/etc --enable-shared \
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50 | --without-libpam --without-audit --without-selinux \
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51 | --cache-file=config.cache</userinput></screen>
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52 |
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53 | <para os="f">The meaning of the configure options:</para>
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54 |
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55 | <variablelist os="g">
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56 | <varlistentry>
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57 | <term><parameter>--sysconfdir=/etc</parameter></term>
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58 | <listitem><para>Tells Shadow to install its configuration files into
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59 | /etc, rather than /usr/etc.</para></listitem>
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60 | </varlistentry>
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61 | <varlistentry>
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62 | <term><parameter>--without-libpam</parameter></term>
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63 | <listitem><para>Support for Linux-PAM is enabled by default in Shadow,
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64 | however PAM is not installed on a base CLFS system, so this switch
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65 | disables PAM support in Shadow. For instructions to install PAM and
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66 | link Shadow to it, you can look at
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67 | <ulink url="&blfs-root;view/svn/postlfs/shadow.html"/>.</para></listitem>
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68 | </varlistentry>
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69 | <varlistentry>
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70 | <term><parameter>--without-audit</parameter></term>
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71 | <listitem><para>Support for auditing is enabled by default, but a
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72 | library that it needs is not installed in a base CLFS system. This
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73 | switch disables auditing support.</para></listitem>
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74 | </varlistentry>
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75 | <varlistentry>
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76 | <term><parameter>--without-selinux</parameter></term>
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77 | <listitem><para>Support for selinux is enabled by default, but selinux
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78 | is not built in a base CLFS system and configure will fail without this
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79 | switch.</para></listitem>
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80 | </varlistentry>
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81 | </variablelist>
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82 |
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83 | <para os="h">Disable the installation of the <command>groups</command>
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84 | program and its man pages, as Coreutils provides a better version:</para>
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85 |
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86 | <screen os="i"><userinput>cp src/Makefile{,.orig}
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87 | sed 's/groups$(EXEEXT) //' src/Makefile.orig > src/Makefile
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88 | cp man/Makefile{,.orig}
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89 | sed '/groups/d' man/Makefile.orig > man/Makefile</userinput></screen>
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90 |
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91 | <para os="j">Compile the package:</para>
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92 |
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93 | <screen os="k"><userinput>make</userinput></screen>
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94 |
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95 | <para os="l">Install the package:</para>
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96 |
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97 | <screen os="m"><userinput>make DESTDIR=${CLFS} install</userinput></screen>
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98 |
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99 | <para id="shadow-login_defs" os="r">Instead of using the default
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100 | <emphasis>crypt</emphasis> method, use the more secure
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101 | <emphasis>MD5</emphasis> method of password encryption, which also allows
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102 | passwords longer than 8 characters. It is also necessary to change the
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103 | obsolete <filename class="directory">/var/spool/mail</filename> location
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104 | for user mailboxes that Shadow uses by default to the <filename
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105 | class="directory">/var/mail</filename> location used currently. Use the
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106 | following sed command to make these changes to the appropriate
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107 | configuration file:</para>
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108 |
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109 | <indexterm zone="shadow-login_defs" os="s">
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110 | <primary sortas="e-/etc/login.defs">/etc/login.defs</primary>
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111 | </indexterm>
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112 |
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113 | <screen os="t"><userinput>cp ${CLFS}/etc/login.defs login.defs.orig
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114 | sed -e's@#MD5_CRYPT_ENAB.no@MD5_CRYPT_ENAB yes@' \
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115 | -e 's@/var/spool/mail@/var/mail@' \
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116 | login.defs.orig > ${CLFS}/etc/login.defs</userinput></screen>
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117 |
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118 | <note os="u">
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119 | <para>If you built Shadow with Cracklib support, execute
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120 | this <command>sed</command> to correct the path to the Cracklib
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121 | dictionary:</para>
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122 |
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123 | <screen role="nodump"><userinput>cp ${CLFS}/etc/login.defs login.defs.orig
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124 | sed 's@DICTPATH.*@DICTPATH\t/lib/cracklib/pw_dict@' login.defs.orig > ${CLFS}/etc/login.defs</userinput></screen>
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125 | </note>
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126 |
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127 | <para os="v">Move a misplaced program to its proper location:</para>
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128 |
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129 | <screen os="w"><userinput>mv -v ${CLFS}/usr/bin/passwd ${CLFS}/bin</userinput></screen>
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130 |
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131 | <para os="x">Move Shadow's dynamic libraries to a more appropriate
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132 | location:</para>
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133 |
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134 | <screen os="y"><userinput>mv -v ${CLFS}/lib/libshadow.*a ${CLFS}/usr/lib
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135 | rm -v ${CLFS}/lib/libshadow.so
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136 | ln -svf ../../lib/libshadow.so.0 ${CLFS}/usr/lib/libshadow.so</userinput></screen>
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137 |
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138 | </sect2>
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139 |
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140 | <sect2 id="conf-shadow" role="configuration">
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141 | <title>Configuring Shadow</title>
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142 |
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143 | <indexterm zone="conf-shadow">
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144 | <primary sortas="a-Shadow">Shadow</primary>
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145 | <secondary>configuring</secondary>
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146 | </indexterm>
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147 |
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148 | <para>This package contains utilities to add, modify, and delete users and
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149 | groups; set and change their passwords; and perform other administrative
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150 | tasks. For a full explanation of what <emphasis>password shadowing</emphasis>
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151 | means, see the <filename>doc/HOWTO</filename> file within the unpacked source
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152 | tree. If using Shadow support, keep in mind that programs which need to
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153 | verify passwords (display managers, FTP programs, pop3 daemons, etc.) must
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154 | be Shadow-compliant. That is, they need to be able to work with shadowed
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155 | passwords.</para>
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156 |
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157 | <para>To enable shadowed passwords, run the following command:</para>
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158 |
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159 | <screen role="nodump"><userinput>pwconv</userinput></screen>
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160 |
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161 | <para>To enable shadowed group passwords, run:</para>
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162 |
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163 | <screen role="nodump"><userinput>grpconv</userinput></screen>
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164 |
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165 | <para>To view or change the default settings for new user accounts that
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166 | you create, you can edit <filename>/etc/default/useradd</filename>. See
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167 | <command>man useradd</command> or
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168 | <ulink url="&blfs-root;view/svn/postlfs/skel.html"/> for more
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169 | information.</para>
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170 |
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171 | </sect2>
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172 |
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173 | <sect2 id="root-password" role="configuration">
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174 | <title>Setting the root password</title>
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175 |
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176 | <para>Choose a password for user <systemitem
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177 | class="username">root</systemitem> and set it by running:</para>
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178 |
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179 | <screen role="nodump"><userinput>passwd root</userinput></screen>
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180 |
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181 | </sect2>
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182 |
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183 | <sect2 id="contents-shadow" role="content">
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184 | <title>Contents of Shadow</title>
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185 |
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186 | <segmentedlist>
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187 | <segtitle>Installed programs</segtitle>
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188 | <segtitle>Installed libraries</segtitle>
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189 |
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190 | <seglistitem>
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191 | <seg>chage, chfn, chpasswd, chgpasswd, chsh, expiry, faillog, gpasswd,
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192 | groupadd, groupdel, groupmod, grpck, grpconv, grpunconv, lastlog,
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193 | login, logoutd, newgrp, newusers, nologin, passwd, pwck, pwconv,
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194 | pwunconv, sg (link to newgrp), useradd, userdel, usermod,
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195 | vigr (link to vipw), and vipw</seg>
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196 | <seg>libshadow.[a,so]</seg>
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197 | </seglistitem>
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198 | </segmentedlist>
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199 |
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200 | <variablelist>
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201 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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202 | <?dbfo list-presentation="list"?>
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203 | <?dbhtml list-presentation="table"?>
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204 |
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205 | <varlistentry id="chage">
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206 | <term><command>chage</command></term>
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207 | <listitem>
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208 | <para>Used to change the maximum number of days between obligatory
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209 | password changes</para>
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210 | <indexterm zone="ch-system-shadow chage">
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211 | <primary sortas="b-chage">chage</primary>
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212 | </indexterm>
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213 | </listitem>
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214 | </varlistentry>
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215 |
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216 | <varlistentry id="chfn">
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217 | <term><command>chfn</command></term>
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218 | <listitem>
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219 | <para>Used to change a user's full name and other information</para>
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220 | <indexterm zone="ch-system-shadow chfn">
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221 | <primary sortas="b-chfn">chfn</primary>
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222 | </indexterm>
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223 | </listitem>
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224 | </varlistentry>
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225 |
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226 | <varlistentry id="chgpasswd">
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227 | <term><command>chgpasswd</command></term>
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228 | <listitem>
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229 | <para>Used to update group passwords in batch mode</para>
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230 | <indexterm zone="ch-system-shadow chgpasswd">
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231 | <primary sortas="b-chgpasswd">chgpasswd</primary>
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232 | </indexterm>
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233 | </listitem>
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234 | </varlistentry>
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235 |
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236 | <varlistentry id="chpasswd">
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237 | <term><command>chpasswd</command></term>
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238 | <listitem>
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239 | <para>Used to update the passwords of an entire series of user
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240 | accounts</para>
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241 | <indexterm zone="ch-system-shadow chpasswd">
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242 | <primary sortas="b-chpasswd">chpasswd</primary>
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243 | </indexterm>
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244 | </listitem>
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245 | </varlistentry>
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246 |
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247 | <varlistentry id="chsh">
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248 | <term><command>chsh</command></term>
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249 | <listitem>
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250 | <para>Used to change a user's default login shell</para>
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251 | <indexterm zone="ch-system-shadow chsh">
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252 | <primary sortas="b-chsh">chsh</primary>
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253 | </indexterm>
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254 | </listitem>
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255 | </varlistentry>
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256 |
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257 | <varlistentry id="expiry">
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258 | <term><command>expiry</command></term>
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259 | <listitem>
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260 | <para>Checks and enforces the current password expiration policy</para>
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261 | <indexterm zone="ch-system-shadow expiry">
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262 | <primary sortas="b-expiry">expiry</primary>
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263 | </indexterm>
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264 | </listitem>
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265 | </varlistentry>
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266 |
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267 | <varlistentry id="faillog">
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268 | <term><command>faillog</command></term>
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269 | <listitem>
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270 | <para>Is used to examine the log of login failures, to set a maximum
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271 | number of failures before an account is blocked, or to reset the
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272 | failure count</para>
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273 | <indexterm zone="ch-system-shadow faillog">
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274 | <primary sortas="b-faillog">faillog</primary>
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275 | </indexterm>
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276 | </listitem>
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277 | </varlistentry>
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278 |
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279 | <varlistentry id="gpasswd">
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280 | <term><command>gpasswd</command></term>
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281 | <listitem>
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282 | <para>Is used to add and delete members and administrators to
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283 | groups</para>
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284 | <indexterm zone="ch-system-shadow gpasswd">
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285 | <primary sortas="b-gpasswd">gpasswd</primary>
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286 | </indexterm>
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287 | </listitem>
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288 | </varlistentry>
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289 |
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290 | <varlistentry id="groupadd">
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291 | <term><command>groupadd</command></term>
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292 | <listitem>
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293 | <para>Creates a group with the given name</para>
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294 | <indexterm zone="ch-system-shadow groupadd">
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295 | <primary sortas="b-groupadd">groupadd</primary>
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296 | </indexterm>
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297 | </listitem>
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298 | </varlistentry>
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299 |
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300 | <varlistentry id="groupdel">
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301 | <term><command>groupdel</command></term>
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302 | <listitem>
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303 | <para>Deletes the group with the given name</para>
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304 | <indexterm zone="ch-system-shadow groupdel">
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305 | <primary sortas="b-groupdel">groupdel</primary>
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306 | </indexterm>
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307 | </listitem>
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308 | </varlistentry>
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309 |
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310 | <varlistentry id="groupmod">
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311 | <term><command>groupmod</command></term>
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312 | <listitem>
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313 | <para>Is used to modify the given group's name or GID</para>
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314 | <indexterm zone="ch-system-shadow groupmod">
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315 | <primary sortas="b-groupmod">groupmod</primary>
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316 | </indexterm>
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317 | </listitem>
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318 | </varlistentry>
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319 |
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320 | <varlistentry id="grpck">
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321 | <term><command>grpck</command></term>
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322 | <listitem>
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323 | <para>Verifies the integrity of the group files
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324 | <filename>/etc/group</filename> and
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325 | <filename>/etc/gshadow</filename></para>
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326 | <indexterm zone="ch-system-shadow grpck">
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327 | <primary sortas="b-grpck">grpck</primary>
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328 | </indexterm>
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329 | </listitem>
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330 | </varlistentry>
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331 |
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332 | <varlistentry id="grpconv">
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333 | <term><command>grpconv</command></term>
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334 | <listitem>
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335 | <para>Creates or updates the shadow group file from the normal
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336 | group file</para>
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337 | <indexterm zone="ch-system-shadow grpconv">
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338 | <primary sortas="b-grpconv">grpconv</primary>
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339 | </indexterm>
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340 | </listitem>
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341 | </varlistentry>
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342 |
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343 | <varlistentry id="grpunconv">
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344 | <term><command>grpunconv</command></term>
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345 | <listitem>
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346 | <para>Updates <filename>/etc/group</filename> from
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347 | <filename>/etc/gshadow</filename> and then deletes the latter</para>
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348 | <indexterm zone="ch-system-shadow grpunconv">
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349 | <primary sortas="b-grpunconv">grpunconv</primary>
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350 | </indexterm>
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351 | </listitem>
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352 | </varlistentry>
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353 |
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354 | <varlistentry id="lastlog">
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355 | <term><command>lastlog</command></term>
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356 | <listitem>
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357 | <para>Reports the most recent login of all users or of a
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358 | given user</para>
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359 | <indexterm zone="ch-system-shadow lastlog">
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360 | <primary sortas="b-lastlog">lastlog</primary>
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361 | </indexterm>
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362 | </listitem>
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363 | </varlistentry>
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364 |
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365 | <varlistentry id="login">
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366 | <term><command>login</command></term>
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367 | <listitem>
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368 | <para>Is used by the system to let users sign on</para>
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369 | <indexterm zone="ch-system-shadow login">
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370 | <primary sortas="b-login">login</primary>
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371 | </indexterm>
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372 | </listitem>
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373 | </varlistentry>
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374 |
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375 | <varlistentry id="logoutd">
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376 | <term><command>logoutd</command></term>
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377 | <listitem>
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378 | <para>Is a daemon used to enforce restrictions on log-on time
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379 | and ports</para>
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380 | <indexterm zone="ch-system-shadow logoutd">
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381 | <primary sortas="b-logoutd">logoutd</primary>
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382 | </indexterm>
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383 | </listitem>
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384 | </varlistentry>
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385 |
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386 | <varlistentry id="newgrp">
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387 | <term><command>newgrp</command></term>
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388 | <listitem>
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389 | <para>Is used to change the current GID during a login session</para>
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390 | <indexterm zone="ch-system-shadow newgrp">
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391 | <primary sortas="b-newgrp">newgrp</primary>
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392 | </indexterm>
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393 | </listitem>
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394 | </varlistentry>
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395 |
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396 | <varlistentry id="newusers">
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397 | <term><command>newusers</command></term>
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398 | <listitem>
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399 | <para>Is used to create or update an entire series of user
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400 | accounts</para>
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401 | <indexterm zone="ch-system-shadow newusers">
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402 | <primary sortas="b-newusers">newusers</primary>
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403 | </indexterm>
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404 | </listitem>
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405 | </varlistentry>
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406 |
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407 | <varlistentry id="nologin">
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408 | <term><command>nologin</command></term>
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409 | <listitem>
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410 | <para>Displays a message that an account is not available. Designed
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411 | to be used as the default shell for accounts that have been
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412 | disabled</para>
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413 | <indexterm zone="ch-system-shadow nologin">
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414 | <primary sortas="b-nologin">nologin</primary>
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415 | </indexterm>
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416 | </listitem>
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417 | </varlistentry>
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418 |
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419 | <varlistentry id="passwd">
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420 | <term><command>passwd</command></term>
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421 | <listitem>
|
---|
422 | <para>Is used to change the password for a user or group account</para>
|
---|
423 | <indexterm zone="ch-system-shadow passwd">
|
---|
424 | <primary sortas="b-passwd">passwd</primary>
|
---|
425 | </indexterm>
|
---|
426 | </listitem>
|
---|
427 | </varlistentry>
|
---|
428 |
|
---|
429 | <varlistentry id="pwck">
|
---|
430 | <term><command>pwck</command></term>
|
---|
431 | <listitem>
|
---|
432 | <para>Verifies the integrity of the password files
|
---|
433 | <filename>/etc/passwd</filename> and
|
---|
434 | <filename>/etc/shadow</filename></para>
|
---|
435 | <indexterm zone="ch-system-shadow pwck">
|
---|
436 | <primary sortas="b-pwck">pwck</primary>
|
---|
437 | </indexterm>
|
---|
438 | </listitem>
|
---|
439 | </varlistentry>
|
---|
440 |
|
---|
441 | <varlistentry id="pwconv">
|
---|
442 | <term><command>pwconv</command></term>
|
---|
443 | <listitem>
|
---|
444 | <para>Creates or updates the shadow password file from the normal
|
---|
445 | password file</para>
|
---|
446 | <indexterm zone="ch-system-shadow pwconv">
|
---|
447 | <primary sortas="b-pwconv">pwconv</primary>
|
---|
448 | </indexterm>
|
---|
449 | </listitem>
|
---|
450 | </varlistentry>
|
---|
451 |
|
---|
452 | <varlistentry id="pwunconv">
|
---|
453 | <term><command>pwunconv</command></term>
|
---|
454 | <listitem>
|
---|
455 | <para>Updates <filename>/etc/passwd</filename> from
|
---|
456 | <filename>/etc/shadow</filename> and then deletes the latter</para>
|
---|
457 | <indexterm zone="ch-system-shadow pwunconv">
|
---|
458 | <primary sortas="b-pwunconv">pwunconv</primary>
|
---|
459 | </indexterm>
|
---|
460 | </listitem>
|
---|
461 | </varlistentry>
|
---|
462 |
|
---|
463 | <varlistentry id="sg">
|
---|
464 | <term><command>sg</command></term>
|
---|
465 | <listitem>
|
---|
466 | <para>Executes a given command while the user's GID
|
---|
467 | is set to that of the given group</para>
|
---|
468 | <indexterm zone="ch-system-shadow sg">
|
---|
469 | <primary sortas="b-sg">sg</primary>
|
---|
470 | </indexterm>
|
---|
471 | </listitem>
|
---|
472 | </varlistentry>
|
---|
473 |
|
---|
474 | <varlistentry id="su">
|
---|
475 | <term><command>su</command></term>
|
---|
476 | <listitem>
|
---|
477 | <para>Runs a shell with substitute user and group IDs</para>
|
---|
478 | <indexterm zone="ch-system-shadow su">
|
---|
479 | <primary sortas="b-su">su</primary>
|
---|
480 | </indexterm>
|
---|
481 | </listitem>
|
---|
482 | </varlistentry>
|
---|
483 |
|
---|
484 | <varlistentry id="useradd">
|
---|
485 | <term><command>useradd</command></term>
|
---|
486 | <listitem>
|
---|
487 | <para>Creates a new user with the given name, or updates the default
|
---|
488 | new-user information</para>
|
---|
489 | <indexterm zone="ch-system-shadow useradd">
|
---|
490 | <primary sortas="b-useradd">useradd</primary>
|
---|
491 | </indexterm>
|
---|
492 | </listitem>
|
---|
493 | </varlistentry>
|
---|
494 |
|
---|
495 | <varlistentry id="userdel">
|
---|
496 | <term><command>userdel</command></term>
|
---|
497 | <listitem>
|
---|
498 | <para>Deletes the given user account</para>
|
---|
499 | <indexterm zone="ch-system-shadow userdel">
|
---|
500 | <primary sortas="b-userdel">userdel</primary>
|
---|
501 | </indexterm>
|
---|
502 | </listitem>
|
---|
503 | </varlistentry>
|
---|
504 |
|
---|
505 | <varlistentry id="usermod">
|
---|
506 | <term><command>usermod</command></term>
|
---|
507 | <listitem>
|
---|
508 | <para>Is used to modify the given user's login name, User
|
---|
509 | Identification (UID), shell, initial group, home directory, etc.</para>
|
---|
510 | <indexterm zone="ch-system-shadow usermod">
|
---|
511 | <primary sortas="b-usermod">usermod</primary>
|
---|
512 | </indexterm>
|
---|
513 | </listitem>
|
---|
514 | </varlistentry>
|
---|
515 |
|
---|
516 | <varlistentry id="vigr">
|
---|
517 | <term><command>vigr</command></term>
|
---|
518 | <listitem>
|
---|
519 | <para>Edits the <filename>/etc/group</filename> or
|
---|
520 | <filename>/etc/gshadow</filename> files</para>
|
---|
521 | <indexterm zone="ch-system-shadow vigr">
|
---|
522 | <primary sortas="b-vigr">vigr</primary>
|
---|
523 | </indexterm>
|
---|
524 | </listitem>
|
---|
525 | </varlistentry>
|
---|
526 |
|
---|
527 | <varlistentry id="vipw">
|
---|
528 | <term><command>vipw</command></term>
|
---|
529 | <listitem>
|
---|
530 | <para>Edits the <filename>/etc/passwd</filename> or
|
---|
531 | <filename>/etc/shadow</filename> files</para>
|
---|
532 | <indexterm zone="ch-system-shadow vipw">
|
---|
533 | <primary sortas="b-vipw">vipw</primary>
|
---|
534 | </indexterm>
|
---|
535 | </listitem>
|
---|
536 | </varlistentry>
|
---|
537 |
|
---|
538 | <varlistentry id="libshadow">
|
---|
539 | <term><filename class="libraryfile">libshadow</filename></term>
|
---|
540 | <listitem>
|
---|
541 | <para>Contains functions used by most programs in this package</para>
|
---|
542 | <indexterm zone="ch-system-shadow libshadow">
|
---|
543 | <primary sortas="c-libshadow">libshadow</primary>
|
---|
544 | </indexterm>
|
---|
545 | </listitem>
|
---|
546 | </varlistentry>
|
---|
547 |
|
---|
548 | </variablelist>
|
---|
549 |
|
---|
550 | </sect2>
|
---|
551 |
|
---|
552 | </sect1>
|
---|