blockmean(1gmt) on Linux
The text 944c74e70160, as Debian 4.0 (Etch) shipped it.
filter to block average (x,y,z) data by L2 norm
Flags it lists
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-: -
-C -
-E -
-F -
-H -
-I -
-R -
-S -
-V -
-W -
-bi -
-bo -
-f