Fix part of #1963 (use ATTRS instead of SYSFS), add the note about the backslash at the end of each line back into the book, and add a reference to #1912 to the changelog entry from r7924.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@7926 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

1 files changed, 14 insertions, 2 deletions

diff --git a/chapter07/symlinks.xml b/chapter07/symlinks.xml
index 1407d553f..5846a46e0 100644
--- a/chapter07/symlinks.xml
+++ b/chapter07/symlinks.xml
@@ -122,13 +122,25 @@
 <screen role="nodump"><userinput>cat &gt; /etc/udev/rules.d/83-duplicate_devs.rules &lt;&lt; EOF
 <literal>
 # Persistent symlinks for webcam and tuner
-KERNEL=="video*", SYSFS{idProduct}=="1910", SYSFS{idVendor}=="0d81", \
+KERNEL=="video*", ATTRS{idProduct}=="1910", ATTRS{idVendor}=="0d81", \
     SYMLINK+="webcam"
-KERNEL=="video*", SYSFS{device}=="0x036f", SYSFS{vendor}=="0x109e", \
+KERNEL=="video*", ATTRS{device}=="0x036f", ATTRS{vendor}=="0x109e", \
     SYMLINK+="tvtuner"
 </literal>
 EOF</userinput></screen>
 
+    <note>
+      <para>Be aware that Udev does not recognize the backslash for line
+      continuation.  This example works properly because both the backslash
+      and newline are ignored by the shell.  This makes the shell send each
+      rule to cat on only one line.  (The shell ignores this sequence because
+      the EOF string used in the here-document redirection is not enclosed in
+      either double or single quotes.  For more details, see the bash(1)
+      manpage, and search it for "Here Documents".)</para> 
+      <para>If modifying Udev rules with an editor, be sure to leave each
+      rule on one physical line.</para>
+    </note>
+
     <para>The result is that <filename>/dev/video0</filename> and
     <filename>/dev/video1</filename> devices still refer randomly to the tuner
     and the web camera (and thus should never be used directly), but there are