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Comparing Three Files
Use the program diff3 to compare three files and show any differences among them.
See
A Third Sample Input File, Detailed Description of diff3 Normal Format, diff3 Hunks and An Example of diff3 Normal Format.
diff3 can also merge files; see Merging from a Common Ancestor).
The "normal"
diff3 output format shows each hunk of differences without surrounding context.
Hunks are labeled depending on whether they are two-way or three-way, and lines
are annotated by their location in the input files.
See
Invoking diff3 for more information on how to run diff3.