/usr/share/doc/libghc-glut-doc/examples/RedBook8/Chapter01/triangles.frag is in libghc-glut-doc 2.7.0.12-1build5.
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 | #version 430 core
out vec4 fColor;
void
main()
{
fColor = vec4(0.0, 0.0, 1.0, 1.0);
}
|