how many different ways we can remove the file from a directory structure.
 

Except the rm command can we remove the file from the directory structure ?

I've doubt regarding can we redirect the desire directory structure to the /dev/null or /dev/zero so that all the content is as null..

how can i achieve this things ?

What problem are you trying to solve?

You can't re-direct a directory structure to /dev/null. You re-direct DATA (to any number of places, including /dev/null)

there is an another command called "unlink" . but it can only delete files not directories .

Given thaqt directories are just special files, I suppose you could just edit them with debugfs or the like, however this is a really bad idea in all but the most desperate of circumstances (e.g. trying to recover a seriously hosed filesystem), and it should never, ever be done on a mounted filesystem.

Like pixellany asked, what exactly are you trying to do that you can't use rm?

The thing is that there is some million files in a directory , my i am trying to remove all these but by using rm it takes lots of time .

so can it possible in the fraction of second to this??

The slow performance is not the rm(1) command, it is the updating of the directory itself, which is a slow operation. Changes have to be written to the disk upon each unlink(2) operation.

try this
cd / to folder ( cd /home/me/tempfiles1 )
rm -I *

see : "rm --help" or "man rm"
there also is
shred -n 1 -u *
but this will take a while

The chosen filesystem has a big impact on this. Some filesystems are faster than others at deleting files. You can't just redirect a tree to null nor anything like that. The files need to be unlinked from the filesystem one by one, directories can't be deleted unless the only files inside them are . and ..

rm is as fast as it can be, if the file list is really really long, you can use xargs to work around it.

yes, shred is more secure to use for the remove the file system.

Thank you