blockmedian(1gmt) on Linux
The text a4bd3e58c875, as Debian 8 (Jessie), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
filter to block average (x,y,z) data by L1 norm.
Flags it lists
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-: -
-C -
-F -
-H -
-I -
-L -
-Q -
-R -
-V -
-W -
-bi -
-bo