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vdiff: /vee'dif/ v.,n. 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.