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+idiff is an interactive front-end to the diff(1) program.
+
+Taken from "The Unix Programming Environment" book, by Kernighan and
+Pike.
+
+When a difference is found, idiff gives you the opportunity to use the
+old portion ('<'), the new portion ('>') or to edit the difference via
+an editor. Shell escapes can also be made.
+
+Output is placed in the idiff.out file.