how to defragment linux file system?

Sat Mar 20 10:42:52 UTC 2010

On 20-03-10 07:08, ANDY wrote:
> IMHO, the very common defragmentation topic should be included under the
> system's Help and Support menu/search.

I disagree, it should be documented on these pages:

https://help.ubuntu.com/
  https://help.ubuntu.com/community
   https://help.ubuntu.com/community/CommonQuestions
https://help.ubuntu.com/community/SwitchingToUbuntu/FromWindows
https://help.ubuntu.com/community/LinuxFilesystemsExplained

The Help and Support menu/search should point the user to these pages.
Defragmentation is a medium-advanced topic. Most Windows users haven't 
heard about fragmentation, or if they have, they don't know what it means.