Clarify chapter 7 stripping and backup

In chapter 7 we do not need to unmount file systems to strip binaries.
Move unmounting to the backup/restore sections.

Also make sure the stripping commands are valid.

chapter07/stripping.xml

@@ -55,28 +55,27 @@
   </para>
 
   <para>
-    Leave the chroot environment and unmount the kernel virtual file
+     Now, if you are stripping installed files or making a backup, 
-    systems:
+     leave the chroot environment:
   </para>
 
-  <note>
+<screen role="nodump"><userinput>exit</userinput></screen>
+
+  <important>
     <para>All of the following instructions are executed by
       <systemitem class="username">root</systemitem>. Take extra
       care about the commands you're going to run as mistakes
       here can modify your host system. Be aware that the
-      environment variable <envar>LFS</envar> is set for user 
+      environment variables <envar>LFS</envar> and <envar>LFS_TGT</envar>
-      <systemitem class="username">lfs</systemitem> by default 
+      are set for user <systemitem class="username">lfs</systemitem> by default 
-      but it might <emphasis>not</emphasis> be set for 
+      but may <emphasis>not</emphasis> be set for 
       <systemitem class="username">root</systemitem>. Whenever 
       commands are to be executed by <systemitem class="username">root</systemitem>, 
-      make sure you have set <envar>LFS</envar> accordingly.
+      make sure you have set <envar>LFS</envar> and <envar>LFS_TGT</envar> accordingly.
       This has been discussed in <xref linkend='ch-partitioning-aboutlfs'/>.
     </para>
-  </note>
+  </important>
 
-<screen role="nodump"><userinput>exit
-umount $LFS/dev{/pts,}
-umount $LFS/{sys,proc,run}</userinput></screen>
 
   <sect2>
     <title>Stripping</title>
@@ -87,15 +86,15 @@ umount $LFS/{sys,proc,run}</userinput></screen>
     symbols.</para>
 
     <para>Strip off debugging symbols from binaries:</para>
-<screen role="nodump"><userinput>$LFS_TGT-strip --strip-unneeded $LFS/usr/lib/*
+
-$LFS_TGT-strip --strip-unneeded $LFS/usr/{,s}bin/*
+    <screen role="nodump"><userinput>cd $LFS/tools/$LFS_TGT
-$LFS_TGT-strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
+bin/strip --strip-unneeded $LFS/usr/lib/*
+bin/strip --strip-unneeded $LFS/usr/{,s}bin/*
+bin/strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
 
     <para>These commands will skip a number of files reporting that it does not
     recognize their file format. Most of these are scripts instead of binaries.
-    <!--Note that we use the <command>strip</command> program built in
+    </para>
-    <quote>Binutils pass 2</quote>, since it is the one that knows how to strip
-    our cross-compiled programs.--></para>
 
     <para>At this point, you should have at least 5 GB of free space on the
     chroot partition that can be used to build and install Glibc and GCC in
@@ -125,14 +124,19 @@ $LFS_TGT-strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
       <systemitem class="username">root</systemitem>.
     </para>
 
+    <para>Before we make a backup, unmount the virtual file systems:</para>
+
+<screen role="nodump"><userinput>umount $LFS/dev{/pts,}
+umount $LFS/{sys,proc,run}</userinput></screen>
+
     <para>
       Create the backup archive by running the following command:
     </para>
 
-<screen role="nodump" revision="sysv"><userinput>cd $LFS &amp;&amp;
+<screen role="nodump" revision="sysv"><userinput>cd $LFS 
 tar -cJpf $HOME/lfs-temp-tools-&version;.tar.xz .</userinput></screen>
 
-<screen role="nodump" revision="systemd"><userinput>cd $LFS &amp;&amp;
+<screen role="nodump" revision="systemd"><userinput>cd $LFS 
 tar -cJpf $HOME/lfs-temp-tools-&versiond;.tar.xz .</userinput></screen>
 
     <para>
@@ -158,12 +162,12 @@ tar -cJpf $HOME/lfs-temp-tools-&versiond;.tar.xz .</userinput></screen>
 <!-- Make the following look different so users don't blindly run the
      restore when they don't need to. -->
 
-<screen role="nodump" revision="sysv"><computeroutput>cd $LFS &amp;&amp;
+<screen role="nodump" revision="sysv"><computeroutput>cd $LFS 
-rm -rf ./* &amp;&amp;
+rm -rf ./* 
 tar -xpf $HOME/lfs-temp-tools-&version;.tar.xz</computeroutput></screen>
 
-<screen role="nodump" revision="systemd"><computeroutput>cd $LFS &amp;&amp;
+<screen role="nodump" revision="systemd"><computeroutput>cd $LFS 
-rm -rf ./* &amp;&amp;
+rm -rf ./* 
 tar -xpf $HOME/lfs-temp-tools-&versiond;.tar.xz</computeroutput></screen>
 
     <para>
@@ -173,8 +177,8 @@ tar -xpf $HOME/lfs-temp-tools-&versiond;.tar.xz</computeroutput></screen>
 
     <important>
       <para>
-        If you left the chroot environment either to strip off debug
+        If you left the chroot environment 
-        symbols, create a backup, or restart building using a restore, 
+        to create a backup or restart building using a restore, 
         remember to check that the virtual filesystems are still 
         mounted (<command>findmnt | grep $LFS</command>). 
         If they are not mounted, remount them now as