/usr/share/dune-grid/grids/dgf/grid3Y.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 | DGF
Interval
0 0 0 % first corner
10 10 10 % second corner
4 4 3 % 5 cells in x, 2 in y, and 10 in z direction
#
simplex
#
BOUNDARYDOMAIN
default 1 % default boundary id
% all boundary segments in the interval [(-1,-1,-1),(11,11,0)]
% have boundary id 2, i.e., the bottom boundary
2 -1 -1 -1 11 11 0
#
# examplegrid6.dgf
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