/usr/bin/pirb is in ruby-proxifier 1.0.3-1.
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 8 | #!/usr/bin/ruby
executable = File.expand_path("../" + Gem.default_exec_format % "irb", Gem.ruby)
full_gem_path = Gem.loaded_specs["proxifier"].full_gem_path
load_paths = Gem.loaded_specs["proxifier"].require_paths.map { |p| "-I#{File.join(full_gem_path, p)}" }
# TODO: support argument switches
exec(executable, *load_paths, "-rproxifier/env", *ARGV)
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