Re: How to compute sha256sum

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On Thu, Nov 19, 2009 at 1:11 PM, Reg Clemens <reg@xxxxxxx> wrote:
This may seem to be a stupid question, but .

I can download a iso image of Fedora, then do a sha256sum of the file
and I get the result shown in the SHASUM file.

I can burn a DVD with k3b, ask for it to verify the checksum, and
have it say the checksum is OK.

But if I just do
       sha256sum /dev/cdrom

I get a result which is NOT the published sum, even tho k3b said the
sum was going to be OK.

So what am I doing wrong?  (and yes cdrom and dvd both point to sr0)

--
                                       Reg.Clemens
                                       reg@xxxxxxx


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Try

dd if=/dev/cdrom of=/home/reg/DVD-image.iso

Then

sha256sum /home/reg/DVD-image.iso

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