how to defragment linux file system?

[Mike McMullin]

On Sat, 2010-03-20 at 04:42 +0000, admhardsoft at yahoo.ca wrote:
> You don't need defragment the HDD in linux, linux have a good file system and know locate in the exact place all cluster and track.
> But this is my opinion if you want find out more by google or in this list.
> Tomas

> ReplyTo: Ubuntu user technical support,not for general discussions
> Subject: how to defragment linux file system?
> Sent: Mar 20, 2010 12:24 AM
> 
> Hi. I am new to linux. Please tell me how to defragment ext3 filesystem?

  The really good question would be, "how efficient are the File Systems
in Linux in terms of optimizing disk space?".