/usr/share/dune-grid/grids/dgf/examplegrid5.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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Interval
0 0 % first corner
1 1 % second corner
4 8 % 4 cells in x and 8 in y direction
#
Simplex
#
GridParameter
% set overlap to 1
overlap 1
% set closure to none for UGGrid
closure none
% generate copies in UGGrid
copies yes
% set heap size for UGGrid
heapsize 1000
#
PERIODICFACETRANSFORMATION
% set periodic boundaries in x direction
% 1 0, 0 1 + 1 0
#
BOUNDARYDOMAIN
default 1 % default boundary id
#BOUNDARYDOMAIN
# examplegrid5.dgf
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