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

[ping song]

thanks.
but guess I haven't make it clear.

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").

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

head --lines=-100 myfile.gz > newfile.gz

after this , gzip can't recogize it. that's it.

but , I doubt this is not the safe way, coz an gzip expert might be easily
open the binary file and fixed the missed lines (I'm not sure).

maybe I better 'sort' the whole file, or, swap randomly some lines, so
there is no way the file can be read...



On Sat, Jan 25, 2014 at 12:09 PM, Liam Proven <lproven at gmail.com> wrote:

> On 25 January 2014 16:17, ping song <songpingemail at gmail.com> wrote:
> > may sounds like a sin, but I just wanna know the best way to change a
> binary
> > file without actually open it (since it's really huge)?
>
> Your subject says "destroy". To me that would seem to mean securely erase.
>
> But your body text seems to ask about editing it.
>
> As such, I do not understand what you mean.
>
> If you do mean secure erase, read this:
>
> http://askubuntu.com/questions/57572/how-to-delete-files-in-secure-manner
>
>
> --
> Liam Proven • Profile: http://lproven.livejournal.com/profile
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