-\fBfinddup\fP is a command line utility to find duplicate files, files
-common to two directories or files existing in one directory and not
-in another one.
-
-With a single directory argument, prints the duplicate files found in
-it. With two directories, prints the files common to both.
-
-If the second directory name starts with a ^, prints the files
-existing in DIR1 which do not exist in DIR2.
+With a single directory argument, \fBfinddup\fP prints the duplicated
+files found in it. With two directories, it prints either the files
+common to both DIR1 and DIR2, or with the `not:' prefix, the ones
+present in DIR1 and not in DIR2.