Need to Delete a File for Good -- not even GOD can recover.
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 -n 100 -z secret
Want to remove the file? Use the "u" option.
$ shred -n 100 -z -u test2
It can be applied to a device
$ shred -n 100 -z -u /dev/fd0
CAUTION: Note that shred relies on a very important assumption:
that the file system overwrites data
in place. This is the traditional way to do things, but many
modern file system designs do not sat-
isfy this assumption. The following are examples of file
systems on which shred is not effective, or
is not guaranteed to be effective in all file system modes:
* log-structured or journaled file systems, such as those
supplied with
AIX and Solaris (and JFS, ReiserFS, XFS, Ext3, etc.)
