rdup(1) on Linux
The text e20463af42f0, as Debian 10 (Buster), Debian 9 (Stretch) shipped it. The page shows this text now.
generate a file list suitable for making backups
Flags it lists
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-E -
-F -
-M -
-N -
-P -
-R -
-V -
-a -
-h -
-m -
-n -
-r -
-s -
-u -
-v -
-x