| [6370fa6] | 1 | <sect1 id="ch02-aboutlfs">
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| 2 | <title>About $LFS</title>
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| [04f5529] | 3 | <?dbhtml filename="aboutlfs.html" dir="chapter02"?>
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| [6370fa6] | 4 |
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| [b822811] | 5 | <para>Please read the following carefully: throughout this book
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| [97f1db3] | 6 | the variable $LFS will be used frequently. $LFS must at all times be
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| [fada431] | 7 | replaced with the directory where the partition that contains the LFS system
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| [6370fa6] | 8 | is mounted. How to create and where to mount the partition will be
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| [fada431] | 9 | explained in full detail in chapter 4. For example, let's assume that
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| 10 | the LFS partition is mounted on /mnt/lfs.</para>
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| [97f1db3] | 11 |
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| [b822811] | 12 | <para>For example when you are told to run a command like
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| [ff9fe017] | 13 | <userinput>./configure --prefix=$LFS</userinput> you actually have to
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| [b822811] | 14 | execute <userinput>./configure --prefix=/mnt/lfs</userinput></para>
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| [6370fa6] | 15 |
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| [b822811] | 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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| [6370fa6] | 18 |
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| [b822811] | 19 | <para>A possible solution is to set the environment variable LFS.
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| [fada431] | 20 | This way $LFS can be entered literally instead of replacing it with
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| [97f1db3] | 21 | /mnt/lfs. This is accomplished by running <userinput>export
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| [b822811] | 22 | LFS=/mnt/lfs</userinput>.</para>
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| [6370fa6] | 23 |
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| [b822811] | 24 | <para>Now, if you are told to run a command like <userinput>./configure
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| [97f1db3] | 25 | --prefix=$LFS</userinput> you can type that literally. Your shell will
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| 26 | replace $LFS with /mnt/lfs when it processes the command line (meaning
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| [b822811] | 27 | when you hit enter after having typed the command).</para>
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| [6370fa6] | 28 |
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| [b822811] | 29 | <para>If you plan to use $LFS, do not forget to set the $LFS variable at all
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| [280bcc8] | 30 | times. If the variable is not set and is used in a command, $LFS will
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| [97f1db3] | 31 | be ignored and whatever is left will be executed. A command like
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| 32 | <userinput>echo "root:x:0:0:root:/root:/bin/bash" >
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| 33 | $LFS/etc/passwd</userinput> without the $LFS variable set will
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| 34 | re-create your host system's /etc/passwd file. Simply put: it will
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| [b822811] | 35 | destroy your current password database file.</para>
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| [6370fa6] | 36 |
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| [b822811] | 37 | <para>One way to make sure that $LFS is set at all times is adding it to
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| [97f1db3] | 38 | the /root/.bash_profile and/or /root/.bashrc file(s) so that every time
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| 39 | you login as user root, or you 'su' to user root, the $LFS variable is
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| [b822811] | 40 | set.</para>
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| [6370fa6] | 41 |
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| 42 | </sect1>
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| 43 |
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