gvpack(1) on Linux
The text 39a1d70bb7f0, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
merge and pack disjoint graphs
Flags it lists
-
-? -
-G -
-g -
-m -
-n -
-o -
-s -
-u -
-v