/usr/bin/thor is in ruby-thor 0.18.1.git20140116-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #!/usr/bin/env ruby
# -*- mode: ruby -*-
require 'thor/runner'
$thor_runner = true
Thor::Runner.start
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