How do I image a partition?

["Aaron D. Turner" <aturner best com>]

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I'd like to 'image' a partition on one harddisk to another partition on
another disk of the same size as a form of backup.  It has to be an
'image' copy rather than a file-by-file copy though.

Anyone know how to do this easily from the command line?

- -- 
Aaron Turner           | Either which way, one half dozen or another. 
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