/usr/share/doc/ruby-gsl/examples/poly/cheb.rb is in ruby-gsl 2.1.0.3+dfsg1-1build1.
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 | #!/usr/bin/env ruby
require("gsl")
for n in 0..10
p GSL::Poly.cheb(n)
end
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