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+sdif is inspired by System V sdiff(1) command. The basic feature of
+sdif is making a side-by-side listing of two different files. All
+contents of two files are listed on left and right sides. Center
+column is used to indicate how different those lines. No mark means
+no difference. Added, deleted and modified lines are marked with `-'
+and `+' character.
+
+It also reads and formats the output from diff command from standard
+input. Besides normal diff output, context diff -c and unified diff
+-u output will be handled properly. Combined diff format is also
+supported, but currently limited upto three files.
+
+WWW: https://github.com/kaz-utashiro/sdif