file check

[Matt Sergeant]

Michael Lush wrote:
> 
> Compairing MD5 checksums would /prove/ they are different.  As for 
> proving there the same, there is a (very)^128 tiny chance of a clash... 
> its more likely you'd lose data to a massive to a HDD and backups failure

Doing the md5s you have to read every byte anyway. Just use cmp - at 
least it will bail early if they differ.

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