/usr/share/dune-grid/grids/dgf/cube-2.dgf is in libdune-grid-dev 2.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | DGF
Interval
0 0
1 1
2 2
#
GridParameter
refinementedge arbitrary
overlap 1
#
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