[Ilugc] [Tip] Need to Delete a File for Good ---- not even **GOD** can recover
- From: yogeshg1987@xxxxxxxxx (Yogesh Girikumar)
- Date: Fri Jul 23 11:54:25 2010
2010/7/18 Girish Venkatachalam <girishvenkatachalam@xxxxxxxxx>
You have a file "secret". The following makes it so no one
can read it. If the file was 12 bytes, it's now 4096 after it
has been over written 100 times. There's no way to recover this.
Shred is not completely effective on log-structured and journaled file
systems. e.g. ext3 and ReiserFS
Not effective on RAID, Snapshot based file systems, ZFS, BTRFS etc..
Not effective on Cache based systems and applications that create a "temp
file" e.g. open office.
Not effective on Compressed file systems.
It can be applied to a device
$ shred -n 100 -z -u /dev/fd0
using the dd command is best to destroy data on a device.
e.g. $ dd if=/dev/urandom of=/dev/fd0 bs=4K count=5
if ==> input file [ see below ]
of ==> output file [ your device ]
input file can be a random data file /dev/random or /dev/urandom or zero
file /dev/zero
HTH
Yogesh.
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