optical diff ==>
vdiff
/vee'dif/ Visual diff. The operation of finding differences between two files by
eyeball search. The term "optical diff" has also been reported, and is sometimes
more specifically used for the act of superimposing two nearly identical
printouts on one another and holding them up to a light to spot differences.
Though this method is poor for detecting omissions in the "rear" file, it can
also be used with printouts of graphics, a claim few if any diff programs can
make. See diff.
[Jargon File]
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VDM++
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