|  | @@ -32,8 +32,8 @@ EOF</userinput></screen>
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				|  |  |    ensuring a clean environment.</para>
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				|  |  |  
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				|  |  |    <para>The new instance of the shell is a <emphasis>non-login</emphasis>
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				|  |  | -  shell, which does not read the <filename>/etc/profile</filename> or
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				|  |  | -  <filename>.bash_profile</filename> files, but rather reads the
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				|  |  | +  shell, which does not read, and execute, the conten of <filename>/etc/profile</filename> or
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				|  |  | +  <filename>.bash_profile</filename> files, but rather reads, and executes, the
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				|  |  |    <filename>.bashrc</filename> file instead. Create the
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				|  |  |    <filename>.bashrc</filename> file now:</para>
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				|  |  |  
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				|  | @@ -47,6 +47,12 @@ PATH=/tools/bin:/bin:/usr/bin
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				|  |  |  export LFS LC_ALL LFS_TGT PATH</literal>
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				|  |  |  EOF</userinput></screen>
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				|  |  |  
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				|  |  | +  <variablelist>
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				|  |  | +    <title>The meaning of the command line options in <filename>.bashrc</filename></title>
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				|  |  | +
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				|  |  | +    <varlistentry>
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				|  |  | +      <term><parameter>set +h</parameter></term>
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				|  |  | +      <listitem>
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				|  |  |    <para>The <command>set +h</command> command turns off
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				|  |  |    <command>bash</command>'s hash function. Hashing is ordinarily a useful
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				|  |  |    feature—<command>bash</command> uses a hash table to remember the
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				|  | @@ -58,33 +64,70 @@ EOF</userinput></screen>
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				|  |  |    <filename class="directory">$LFS/tools</filename> as soon as they are
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				|  |  |    available without remembering a previous version of the same program in a
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				|  |  |    different location.</para>
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				|  |  | +      </listitem>
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				|  |  | +    </varlistentry>
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				|  |  |  
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				|  |  | +    <varlistentry>
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				|  |  | +      <term><parameter>umask 022</parameter></term>
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				|  |  | +      <listitem>
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				|  |  |    <para>Setting the user file-creation mask (umask) to 022 ensures that newly
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				|  |  |    created files and directories are only writable by their owner, but are
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				|  |  |    readable and executable by anyone (assuming default modes are used by the
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				|  |  |    <function>open(2)</function> system call, new files will end up with permission
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				|  |  |    mode 644 and directories with mode 755).</para>
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				|  |  | +      </listitem>
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				|  |  | +    </varlistentry>
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				|  |  |  
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				|  |  | +    <varlistentry>
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				|  |  | +      <term><parameter>LFS=/mnt/lfs</parameter></term>
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				|  |  | +      <listitem>
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				|  |  |    <para>The <envar>LFS</envar> variable should be set to the chosen mount
 | 
	
		
			
				|  |  |    point.</para>
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				|  |  | +      </listitem>
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				|  |  | +    </varlistentry>
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				|  |  |  
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				|  |  | +    <varlistentry>
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				|  |  | +      <term><parameter>LC_ALL=POSIX</parameter></term>
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				|  |  | +      <listitem>
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				|  |  |    <para>The <envar>LC_ALL</envar> variable controls the localization of certain
 | 
	
		
			
				|  |  |    programs, making their messages follow the conventions of a specified country.
 | 
	
		
			
				|  |  |    Setting <envar>LC_ALL</envar> to <quote>POSIX</quote> or <quote>C</quote>
 | 
	
		
			
				|  |  |    (the two are equivalent) ensures that everything will work as expected in
 | 
	
		
			
				|  |  |    the chroot environment.</para>
 | 
	
		
			
				|  |  | +      </listitem>
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				|  |  | +    </varlistentry>
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				|  |  |  
 | 
	
		
			
				|  |  | +    <varlistentry>
 | 
	
		
			
				|  |  | +      <term><parameter>LFS_TGT=(uname -m)-lfs-linux-gnu</parameter></term>
 | 
	
		
			
				|  |  | +      <listitem>
 | 
	
		
			
				|  |  |    <para>The <envar>LFS_TGT</envar> variable sets a non-default, but compatible machine
 | 
	
		
			
				|  |  |    description for use when building our cross compiler and linker and when cross
 | 
	
		
			
				|  |  |    compiling our temporary toolchain. More information is contained in
 | 
	
		
			
				|  |  |    <xref linkend="ch-tools-toolchaintechnotes" role=""/>.</para>
 | 
	
		
			
				|  |  | +      </listitem>
 | 
	
		
			
				|  |  | +    </varlistentry>
 | 
	
		
			
				|  |  |  
 | 
	
		
			
				|  |  | +    <varlistentry>
 | 
	
		
			
				|  |  | +      <term><parameter>PATH=/tools/bin:/bin:/usr/bin</parameter></term>
 | 
	
		
			
				|  |  | +      <listitem>
 | 
	
		
			
				|  |  |    <para>By putting <filename class="directory">/tools/bin</filename> ahead of the
 | 
	
		
			
				|  |  |    standard <envar>PATH</envar>, all the programs installed in <xref
 | 
	
		
			
				|  |  |    linkend="chapter-temporary-tools"/> are picked up by the shell immediately after
 | 
	
		
			
				|  |  |    their installation. This, combined with turning off hashing, limits the risk
 | 
	
		
			
				|  |  |    that old programs are used from the host when the same programs are available in
 | 
	
		
			
				|  |  | -  the chapter 5 environment.</para>
 | 
	
		
			
				|  |  | +  the Chapter 5 environment.</para>
 | 
	
		
			
				|  |  | +      </listitem>
 | 
	
		
			
				|  |  | +    </varlistentry>
 | 
	
		
			
				|  |  | +
 | 
	
		
			
				|  |  | +    <varlistentry>
 | 
	
		
			
				|  |  | +      <term><parameter>export LFS LC_ALL LFS_TGT PATH</parameter></term>
 | 
	
		
			
				|  |  | +      <listitem>
 | 
	
		
			
				|  |  | +        <para>While the above commands have set some variables, in order
 | 
	
		
			
				|  |  | +        to make them visible within any sub-shells, we export them</para>
 | 
	
		
			
				|  |  | +      </listitem>
 | 
	
		
			
				|  |  | +    </varlistentry>
 | 
	
		
			
				|  |  | +
 | 
	
		
			
				|  |  | +  </variablelist>
 | 
	
		
			
				|  |  |  
 | 
	
		
			
				|  |  |    <para>Finally, to have the environment fully prepared for building the
 | 
	
		
			
				|  |  |    temporary tools, source the just-created user profile:</para>
 |