blockmedian(1gmt) on Linux
The text 81a354600d4f, as Debian 6.0 (Squeeze) shipped it.
filter to block average (x,y,z) data by L1 norm.
Flags it lists
-
-: -
-C -
-E -
-F -
-H -
-I -
-Q -
-R -
-T -
-V -
-W -
-bi -
-bo -
-f