| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 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-partitioning-aboutlfs">
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| 9 | <?dbhtml filename="aboutlfs.html"?>
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| 10 |
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| 11 | <title>Setting The $LFS Variable</title>
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| 12 |
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| 13 | <para>Throughout this book, the environment variable <envar>LFS</envar> will
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| 14 | be used several times. You should ensure that this variable is always defined
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| 15 | throughout the LFS build process. It should be set to the name of the
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| 16 | directory where you will be building your LFS system - we will use
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| 17 | <filename class="directory">/mnt/lfs</filename> as an example, but the
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| 18 | directory choice is up to you. If you are building LFS on a separate
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| 19 | partition, this directory will be the mount point for the partition.
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| 20 | Choose a directory location and set the variable with the
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| 21 | following command:</para>
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| 22 |
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| 23 | <screen role="nodump"><userinput>export LFS=<replaceable>/mnt/lfs</replaceable></userinput></screen>
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| 24 |
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| 25 | <para>Having this variable set is beneficial in that commands such as
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| 26 | <command>mkdir -v $LFS/tools</command> can be typed literally. The shell
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| 27 | will automatically replace <quote>$LFS</quote> with
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| 28 | <quote>/mnt/lfs</quote> (or whatever the variable was set to) when it
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| 29 | processes the command line.</para>
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| 30 |
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| 31 | <para>Do not forget to check that <envar>LFS</envar> is set whenever
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| 32 | you leave and reenter the current working environment (such as when doing a
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| 33 | <command>su</command> to <systemitem class="username">root</systemitem> or
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| 34 | another user). Check that the <envar>LFS</envar> variable is set up
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| 35 | properly with:</para>
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| 36 |
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| 37 | <screen role="nodump"><userinput>echo $LFS</userinput></screen>
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| 38 |
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| 39 | <para>Make sure the output shows the path to your LFS system's build
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| 40 | location, which is <filename class="directory">/mnt/lfs</filename> if the
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| 41 | provided example was followed. If the output is incorrect, use the command
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| 42 | given earlier on this page to set <envar>$LFS</envar> to the correct
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| 43 | directory name.</para>
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| 44 |
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| 45 | <note><para>One way to ensure that the <envar>LFS</envar> variable is always
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| 46 | set is to edit the <filename>.bash_profile</filename> file in both your
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| 47 | personal home directory and in <filename>/root/.bash_profile</filename> and
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| 48 | enter the export command above. </para></note>
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| 49 |
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| 50 | </sect1>
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