Hi Stewart,
Not sure if this will help you out 
http://en.wikipedia.org/wiki/Md5sum I
am not a user of md5sum myself but I guess the wiki should be a good
starting place. Let me know how you get on! If I get the chance I could
take a look, I am a Unix SA myself but if I can't help then I might be
able to put it to a couple of the Linux SA's where I work.
Mark
 ---------- Forwarded message ----------
 From: stuart bell <sailing1(a)gmail.com>
 Date: 11-Oct-2006 12:07
 Subject: Md5 Sum
 To: newbie(a)mandrivalinux.org
 Hi,
 I am trying to create a cd iso image from a dvd as my laptop only has
 cdrom. when i try to do this from the dvd in my Mandriva 2006 PC. I
 get a message saying that md5sum is not installed. i have searched the
 hard drive and software but no sign of it.
 How and where can i get it? All info must be idiot-proof please!
 Thanks
 Stuart
 --
 Registered Linux Mangler #001
 --
 Registered Linux Mangler #001
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