/usr/share/doc/ruby1.9.1-examples/examples/fib.awk is in ruby1.9.1-examples 1.9.3.484-2ubuntu1.
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 | function fib(n) {
if ( n<2 ) return n; else return fib(n-2) + fib(n-1)
}
BEGIN { print fib(20); }
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