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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="prepare-aboutlfs">
<?dbhtml filename="aboutlfs.html"?>
<title>About $LFS</title>
<para>Throughout this book, the environment variable <envar>LFS</envar> will
be used. It is paramount that this variable is always defined.
It should be set to the mount point chosen for the LFS partition.
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 the LFS partition's mount
point, which is <filename class="directory">/mnt/lfs</filename> if the
provided example was followed. If the output is incorrect, the
variable can be set with:</para>
<screen role="nodump"><userinput>export LFS=/mnt/lfs</userinput></screen>
<para>Having this variable set is beneficial in that commands such as
<command>mkdir $LFS/tools</command> can be typed literally. The shell
will automatically replace <quote>$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 (as when doing a
<command>su</command> to <systemitem class="username">root</systemitem>
or another user).</para>
</sect1>
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