/usr/share/nav_msgs/msg/GridCells.msg is in ros-nav-msgs 1.12.5-3.
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 | #an array of cells in a 2D grid
Header header
float32 cell_width
float32 cell_height
geometry_msgs/Point[] cells
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