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Full Discussion: Undeleting files....
Special Forums UNIX Desktop Questions & Answers Undeleting files.... Post 22635 by LivinFree on Thursday 6th of June 2002 08:26:55 PM
Old 06-06-2002
Well, it's quite a quandry...
If you deleted them, for them to be recoverable to you, if almost surely too much trouble to get them back. You could search the raw disk for text strings to try, but no guarantees (if your admin will even let you).

Now - if you've done something naughty and don't want anyone to find out, it's a different story. Once again, for the end user (non-BOfH admin types) it's not worth it or they don't know how. But if you committed a crime, it's very very hard to completely erase all traces of that. The federal goverment is very determined to get your data out so it can use it against you in court. Even if overwritten many time, patterns can be found inbetween tracks on your HD using special hardware / software combos. You could try running a utility like "wipe" or "bcwipe" and running at least 50 passes with random data, then zero it out, then do the same with the slack space on your files (look for a tool called bmap for Linux, any other Unix, and I think you're SOL) then delete them. No guarantees, either...

Remember mafiaboy (the canadian kid that DDOS'ed CNN, Yahoo, and other big guys)? He threw his harddrive into a lake, where it sat for months. The feds still got data off of it.
Kevin Poulson? He encrypted his files anywhere between 2 and 5 times, then deleted them - the feds got some data out of it...
 

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APC_DELETE_FILE(3)							 1							APC_DELETE_FILE(3)

apc_delete_file - Deletes files from the opcode cache

SYNOPSIS
mixed apc_delete_file (mixed $keys) DESCRIPTION
Deletes the given files from the opcode cache. PARAMETERS
o $keys - The files to be deleted. Accepts a string, array of strings, or an APCIterator object. RETURN VALUES
Returns TRUE on success or FALSE on failure. Or if $keys is an array, then an empty array is returned on success, or an array of failed files is returned. EXAMPLES
Example #1 apc_delete_file(3) example <?php $filename = 'file.php'; if (apc_compile_file($filename)) { if (apc_delete_file($filename)) { echo "Successfully deleted file $filename from APC cache.", PHP_EOL; } } if (apc_compile_file($filename)) { if ($good = apc_delete_file(array($filename, 'donotexist.php'))) { var_dump($good); } } $bad = apc_delete_file('donotexist.php'); var_dump($bad); ?> The above example will output something similar to: Successfully deleted file file.php from APC cache. [Mon May 24 09:30:33 2010] [apc-warning] Could not stat file donotexist.php, unable to delete from cache. in /tmp/test.php on line 13. array(1) { [0]=> string(14) "donotexist.php" } [Mon May 24 09:30:33 2010] [apc-warning] Could not stat file donotexist.php, unable to delete from cache. in /tmp/test.php on line 18. bool(false) SEE ALSO
apc_clear_cache(3), apc_delete(3), apc_exists(3). PHP Documentation Group APC_DELETE_FILE(3)
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