blockmedian(1) on Linux
The text 51361d615c9a, as Debian 2.2 (Potato) shipped it.
filter to block average (x,y,z) data by L1 norm.
Flags it lists
-
-: -
-H -
-I -
-N -
-Q -
-R -
-V -
-W -
-bi -
-bo