Booth, Christopher (Aus) - ATP was once rumoured to have said:
> Ay Caramba
> 
> Does this do what I think it does and is equivalent to format c: in
> dos ?

Nearly - it overwrites /dev/hda with zeros.
 
> There should have been some warning to this, as not everyone is familiar
> with the dd command (including me)

That would have spoilt the joke.

> I stupidly as a joke tried this, thinking that the nc command would actually
> do what was thought.
> 
> Please remember that there are newbies and stubies here

And because of this, I will now cite RULE #1:

NEVER, UNDER ANY CIRCUMSTANCES, RUN RANDOM COMMANDS GIVEN TO YOU BY
SOMEBODY ELSE.  ESPECIALLY AS ROOT.

You should first research the commands being used using info and man
to determine their function, and what each argument supplied is really
doing.

If you can't see how the commands perform the advertised effects,
maybe they don't do that at all.

C.
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