/usr/bin/irb_tioga is in ruby-tioga 1.19.1-2build2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/bash
echo "require 'Tioga/irb_tioga.rb' ; include Tioga::IRB_Tioga ; o '"$1"'; l" > ~/.irb_tioga_cmd.rb
irb -r ~/.irb_tioga_cmd.rb
rm ~/.irb_tioga_cmd.rb
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