| 1 | <sect1 id="ch02-aboutlfs">
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| 2 | <title>About $LFS</title>
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| 3 | <?dbhtml filename="aboutlfs.html" dir="chapter02"?>
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| 4 |
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| 5 | <para>Please read the following carefully: throughout this book
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| 6 | the variable LFS will be used frequently. $LFS must at all times be
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| 7 | replaced with the directory where the partition that contains the LFS system
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| 8 | is mounted. How to create and where to mount the partition will be
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| 9 | explained in full detail in Chapter 4. For example, let's assume that
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| 10 | the LFS partition is mounted on /mnt/lfs.</para>
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| 11 |
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| 12 | <para>When you are told to run a command like
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| 13 | <userinput>./configure --prefix=$LFS/static</userinput> you actually have to
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| 14 | execute <userinput>./configure --prefix=/mnt/lfs/static</userinput>.</para>
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| 15 |
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| 16 | <para>It's important that this is done no matter where it is read; be it in
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| 17 | commands entered in a shell, or in a file edited or created.</para>
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| 18 |
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| 19 | <para>A possible solution is to set the environment variable LFS.
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| 20 | This way $LFS can be entered literally instead of replacing it with
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| 21 | /mnt/lfs. This is accomplished by running: </para>
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| 22 |
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| 23 | <para><screen><userinput>export LFS=/mnt/lfs</userinput></screen></para>
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| 24 |
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| 25 | <para>Now, if you are told to run a command such as
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| 26 | <userinput>./configure --prefix=$LFS/static</userinput>, then you may type
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| 27 | it literally. Your shell will replace $LFS with /mnt/lfs when it processes
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| 28 | the command line (meaning when you hit enter after having typed the
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| 29 | command).</para>
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| 30 |
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| 31 | <para>If you plan to use $LFS, do not forget to set the LFS variable at all
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| 32 | times. If the variable is not set and is used in a command, $LFS will
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| 33 | be ignored and whatever is left will be executed. A command like
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| 34 | <userinput>echo "root:x:0:0:root:/root:/bin/bash" >
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| 35 | $LFS/etc/passwd</userinput> without the LFS variable set will
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| 36 | re-create your host system's /etc/passwd file. Simply put: it will
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| 37 | destroy your current password database file.</para>
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| 38 |
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| 39 | <para>One way to make sure that $LFS is set at all times is adding it to
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| 40 | the /root/.bash_profile and /root/.bashrc files so that every time
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| 41 | you login as user root, or you <userinput>su</userinput> to user root,
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| 42 | the LFS variable is set.</para>
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| 43 |
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| 44 | </sect1>
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| 45 |
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