Add to losetup example

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@1254 7fd9a85b-ad96-42d3-883c-3090e2eb8679

nuttx/Documentation/NuttShell.html

@@ -954,7 +954,10 @@ losetup [-o <offset>] [-r] &lt;dev-path&gt; &lt;file-path&gt;
 <p>
   <b>Synopsis</b>.
    Setup the loop device at &lt;dev-path&gt; to access the file at &lt;file-path&gt; as a block device.
-   Example:
+   In the following example a 256Kb file is created (<code>dd</code>) and <code>losetup</code> is
+   used to make the file accessible as a block device. 
+   A FAT file system is created (<code>mkfatfs</code>) and mounted (<code>mount</code>).
+   Files can then be managed on the loop-mounted file.
 <ul><pre>
 nsh&gt; dd if=/dev/zero of=/tmp/image bs=512 count=512
 nsh&gt; ls -l /tmp
@@ -970,6 +973,13 @@ nsh&gt; ls -l /mnt
 ls -l /mnt
 /mnt:
  drw-rw-rw-       0 example/
+nsh&gt; echo &quot;This is a test&quot; &gt;/mnt/example/atest.txt
+nsh&gt; ls -l /mnt/example
+/mnt/example:
+ -rw-rw-rw-      16 ATEST.TXT
+nsh&gt; cat /mnt/example/atest.txt
+This is a test
+nsh&gt;
 </pre></ul>
 </p>
 

nuttx/examples/nsh/README.txt

@@ -357,6 +357,13 @@ o losetup [-d <dev-path>] | [[-o <offset>] [-r] <ldev-path> <file-path>]
     ls -l /mnt
     /mnt:
      drw-rw-rw-       0 example/
+    nsh> echo "This is a test" >/mnt/example/atest.txt
+    nsh> ls -l /mnt/example
+    /mnt/example:
+     -rw-rw-rw-      16 ATEST.TXT
+    nsh> cat /mnt/example/atest.txt
+    This is a test
+    nsh>
 
 o ls [-lRs] <dir-path>