study doxygen in ubuntu(1)

Three months ago I wanted to study doxygen. Hopefully I can done more than before.
Doxgen is a documentation system for C++, C, Java, Objective-C, python,  cobra and to  some extent PHP, C# and D.  Its'  homesite is  www.doxygen.org  or  http:// www.stack.nl/ ~dimitri /doxygen/ .  The latest version is  1.5.1
My environment is ubuntu6.10 and doxygen 1.4.7 gotten from my sources list. It includes doxygen, doxytag, doxywizard and doxygen-doc. You can get information from there located  at /usr/share/doc/doxygen. The follow is an explanation of simple use of command doxygen.
       You can use doxygen in a number of ways:

       1) Use doxygen to generate a template configuration file:

              doxygen [-s] -g [configName]

              If - is used for configName doxygen will write to standard  out‐
              put.

       2) Use doxygen to update an old configuration file:

              doxygen [-s] -u [configName]

       3)  Use  doxygen to generate documentation using an existing configura‐
       tion file:

              doxygen [configName]

              If  -  is  used  for  configName doxygen will read from standard
              input.

       4) Use doxygen to generate a template style sheet file for RTF, HTML or
       Latex.

       RTF:   doxygen -w rtf styleSheetFile

       HTML:  doxygen -w html headerFile  footerFile  styleSheetFile  [config‐
              File]

       LaTeX: doxygen -w latex headerFile styleSheetFile [configFile]

       5) Use doxygen to generate an rtf extensions file

       RTF:   doxygen -e rtf extensionsFile

       If -s is specified the comments in the config file will be omitted.  If
       configName is omitted ‘Doxyfile’ will be used as a default.
The above usage is the threshold of studying doxygen. The more exercises are done, the more experience will be gotten.