diff3
The diff3 command compares three files and outputs descriptions
of their differences. Its arguments are as follows:
diff3 options... mine older yours
The files to compare are mine, older, and yours.
At most one of these three file names may be `-',
which tells diff3 to read the standard input for that file.
An exit status of 0 means diff3 was successful, 1 means some
conflicts were found, and 2 means trouble.
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