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Add forgotten aboutlfs.xml.

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git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/systemd/BOOK@10578 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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DJ Lucas 2014-06-16 00:32:55 +00:00
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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 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-partitioning-aboutlfs">
<?dbhtml filename="aboutlfs.html"?>
<title>Setting The $LFS Variable</title>
<para>Throughout this book, the environment variable <envar>LFS</envar> will
be used several times. You should ensure that this variable is always defined
throughout the LFS build process. It should be set to the name of the
directory where you will be building your LFS system - we will use
<filename class="directory">/mnt/lfs</filename> as an example, but the
directory choice is up to you. If you are building LFS on a separate
partition, this directory will be the mount point for the partition.
Choose a directory location and set the variable with the
following command:</para>
<screen role="nodump"><userinput>export LFS=<replaceable>/mnt/lfs</replaceable></userinput></screen>
<para>Having this variable set is beneficial in that commands such as
<command>mkdir -v $LFS/tools</command> can be typed literally. The shell
will automatically replace <quote>$LFS</quote> with
<quote>/mnt/lfs</quote> (or whatever the variable was set to) when it
processes the command line.</para>
<para>Do not forget to check that <envar>LFS</envar> is set whenever
you leave and reenter the current working environment (such as when doing a
<command>su</command> to <systemitem class="username">root</systemitem> or
another user). Check that the <envar>LFS</envar> variable is set up
properly with:</para>
<screen role="nodump"><userinput>echo $LFS</userinput></screen>
<para>Make sure the output shows the path to your LFS system's build
location, which is <filename class="directory">/mnt/lfs</filename> if the
provided example was followed. If the output is incorrect, use the command
given earlier on this page to set <envar>$LFS</envar> to the correct
directory name.</para>
<note><para>One way to ensure that the <envar>LFS</envar> variable is always
set is to edit the <filename>.bash_profile</filename> file in both your
personal home directory and in <filename>/root/.bash_profile</filename> and
enter the export command above. </para></note>
</sect1>