/usr/bin/aruba is in ruby-aruba 0.14.2-2.
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 7 | #!/usr/bin/ruby
$LOAD_PATH << File.expand_path('../../lib', __FILE__)
require 'aruba/cli'
Aruba::Cli.start
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