/usr/bin/testrb1.8 is in ruby1.8 1.8.7.352-2ubuntu1.6.
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 | #!/usr/bin/ruby1.8
require 'test/unit'
(r = Test::Unit::AutoRunner.new(true)).process_args(ARGV) or
abort r.options.banner + " tests..."
exit r.run
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