/usr/share/dune-grid/grids/dgf/examplegrid1c.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.
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Vertex % the verticies of the grid
-1 -1 % vertex 0
-0.2 -1 % vertex 1
1 -1 % vertex 2
1 -0.6 % vertex 3
1 1 % vertex 4
-1 1 % vertex 5
0.2 -0.2 % vertex 6
#
CUBE % a cube grid
0 1 5 6 % cube 0, verticies 0,1,5,6
1 2 6 3 % cube 1
6 3 5 4 % cube 2
#
BOUNDARYSEGMENTS
2 1 2 % between vertex 1,2 use id 2
2 2 3 % between vertex 2,3 use id 2
4 3 4 % between vertex 3,4 use id 4
#
BOUNDARYDOMAIN
default 1 % all other boundary segments have id 1
#
# examplegrid1c.dgf
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