MD5 checksums

Hello,

Could someone point me to the offical MD5 utility and the exact command
syntax to use for the following files?

valhalla-i386-disc1.iso
valhalla-i386-disc2.iso
valhalla-i386-disc3.iso

I used a Windows version of MD5 and the checksum did not match. So I now
want to use a command line version, though last time I tried it I had the
syntax wrong and overwrote the iso image.

Thanks