source: BOOK/boot/common/settingenviron.xml@ 5bd60e2

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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
  "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;
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<sect1 id="ch-boot-settingenviron">
  <?dbhtml filename="settingenvironment.html"?>

  <title>Setting Up the Environment</title>

  <para>The new instance of the shell is a <emphasis>non-login</emphasis>
  shell, will read <filename>.bash_profile</filename> file. Create the
  <filename>.bash_profile</filename> file now:</para>

<screen><userinput>cat &gt; ${LFS}/root/.bash_profile &lt;&lt; "EOF"
<literal>PS1='\u:\w\$ '
LC_ALL=POSIX
PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin:/tools/sbin
export LC_ALL PATH PS1</literal>
EOF</userinput></screen>

  <para>The <envar>LC_ALL</envar> variable controls the localization of
  certain programs, making their messages follow the conventions of a
  specified country. If the host system uses a version of Glibc older
  than 2.2.4, having <envar>LC_ALL</envar> set to something other than
  <quote>POSIX</quote> or <quote>C</quote> (during this chapter) may cause
  issues if you exit the chroot environment and wish to return later.
  Setting <envar>LC_ALL</envar> to <quote>POSIX</quote> or <quote>C</quote>
  (the two are equivalent) ensures that everything will work as expected
  in the chroot environment.</para>

  <para>By putting <filename class="directory">/tools/bin</filename> ahead
  of the standard <envar>PATH</envar>, all the programs installed in
  <xref linkend="chapter-temporary-tools"/> are picked up by the shell
  immediately after their installation. This, combined with turning off
  hashing, limits the risk that old programs from the host are being used
  when they should not be used any longer.</para>

</sect1>