ubuntu: destroy a huge binary file and make it non-readable.

[Karl Auer]

On Sat, 2014-01-25 at 16:40 -0500, ping song wrote:
> my goal is to :
> 1) not to delete the file, not to chmod either
> 2) don't change the file size either
> 3) make the gzip file not being able to ungzipped and viewed - just to mess
> up the file and make it not usable (what I meant "destroy").

man shred

> I finally use GNU "head" to delete the last a couple of lines like this:

Your process will leave most of the file perfectly readable to ordinary
file inspection tools. shred will not.

Regards, K.

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Karl Auer (kauer at biplane.com.au)
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