md5sum on CD

[Stewart C. Russell]

Moniz Family wrote:
> I'm having some problems burning CDs and am trying to check whether it's 
> the burner or the CDs. One of the things I'd like to do, but can't 
> figure out from the man pages, is to run an md5sum on the entire CD to 
> compare to the ISO image I downloaded.

Do you mean create an md5sum of all the files in a tree? This is what I use:

#!/bin/sh
# md5here - do md5sum of tree to stdout; defaults to $PWD,
#  otherwise first arg is top level of tree.
# don't send output to somewhere in the tree or you get
#  a file that fails checksum... ;-)
cd ${1-.}
find `pwd` -type f -print0 | xargs -0 md5sum -b | sed "s,`pwd`/,,;"

> Is there a way to do this without 
> first making another ISO image from the CD?

You should be able to mount the ISO image using something like:

  mount -o loop -t iso9660 filename.iso /mnt/iso

cheers,
  Stewart
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