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You know how when in Dos/Windows when you delete a file, it's not really deleted, just marked as deleted in the FAT, but can still be recovered with an "undelete" utility? In order to delete a file so that it cannot be undeleted, you have to use some special program which rewrites that part of the disk with random 1's and 0's.
How about with Linux? When I type rm filename, can that file be recovered, if so, how?
When you delete a file in Linux, the inode that marks the file is marked as clear. As long as that inode is not reused, the you could probably recover the file with the appropiate tools. A quick check on Freshmeat would probably turn up a few tools to do this.
and like stated above, you will get approx. 5 results by doing a search for "undelete", and when i did it, this one caught my eye... also this one here i found on sourceforge which may be of some interest..