/usr/share/dune-grid/grids/dgf/basicunitcube-2d.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 13 14 15 16 17 18 19 | DGF
VERTEX
1 -1
-1 -1
1 1
-1 1
#
SIMPLEX
0 1 2
2 1 3
#
GRIDPARAMETER
NAME BasicUnitCube
REFINEMENTEDGE ARBITRARY
DUMPFILENAME basicunitcube-2d.dgf.native
#
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