rdup(1) on Linux
The text 2b0074e12b35, as Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
generate a file list suitable for making backups
Flags it lists
-
-E -
-F -
-M -
-N -
-R -
-V -
-a -
-h -
-m -
-n -
-r -
-s -
-v -
-x