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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2138 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
46 lines
2.1 KiB
XML
46 lines
2.1 KiB
XML
<sect1 id="ch02-aboutlfs">
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<title>About $LFS</title>
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<?dbhtml filename="aboutlfs.html" dir="chapter02"?>
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<para>Please read the following carefully: throughout this book
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the variable LFS will be used frequently. $LFS must at all times be
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replaced with the directory where the partition that contains the LFS system
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is mounted. How to create and where to mount the partition will be
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explained in full detail in Chapter 4. For example, let's assume that
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the LFS partition is mounted on /mnt/lfs.</para>
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<para>When you are told to run a command like
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<userinput>./configure --prefix=$LFS/static</userinput> you actually have to
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execute <userinput>./configure --prefix=/mnt/lfs/static</userinput>.</para>
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<para>It's important that this is done no matter where it is read; be it in
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commands entered in a shell, or in a file edited or created.</para>
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<para>A possible solution is to set the environment variable LFS.
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This way $LFS can be entered literally instead of replacing it with
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/mnt/lfs. This is accomplished by running: </para>
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<para><screen><userinput>export LFS=/mnt/lfs</userinput></screen></para>
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<para>Now, if you are told to run a command such as
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<userinput>./configure --prefix=$LFS/static</userinput>, then you may type
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it literally. Your shell will replace $LFS with /mnt/lfs when it processes
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the command line (meaning when you hit enter after having typed the
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command).</para>
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<para>If you plan to use $LFS, do not forget to set the LFS variable at all
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times. If the variable is not set and is used in a command, $LFS will
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be ignored and whatever is left will be executed. A command like
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<userinput>echo "root:x:0:0:root:/root:/bin/bash" >
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$LFS/etc/passwd</userinput> without the LFS variable set will
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re-create your host system's /etc/passwd file. Simply put: it will
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destroy your current password database file.</para>
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<para>One way to make sure that $LFS is set at all times is adding it to
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the /root/.bash_profile and /root/.bashrc files so that every time
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you login as user root, or you <userinput>su</userinput> to user root,
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the LFS variable is set.</para>
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</sect1>
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