/usr/ is in ruby-spreadsheet 0.9.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/spreadsheet.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/
/usr/lib/ruby/vendor_ruby/spreadsheet/datatypes.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/formula.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/row.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/column.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/encodings.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/font.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/link.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/workbook.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/format.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/writer.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/helpers.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/worksheet.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/compatibility.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/writer/
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/writer/workbook.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/writer/format.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/writer/biff8.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/writer/n_worksheet.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/writer/worksheet.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/row.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/password_hash.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/sst_entry.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/internals.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/rgb.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/workbook.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/offset.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/error.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/writer.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/worksheet.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/reader/
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/reader/biff5.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/reader/biff8.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/reader.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/internals/
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/internals/biff5.rb
/usr/lib/ruby/vendor_ruby/spreadsheet/excel/internals/biff8.rb
/usr/lib/ruby/vendor_ruby/parseexcel.rb
/usr/lib/ruby/vendor_ruby/parseexcel/
/usr/lib/ruby/vendor_ruby/parseexcel/parseexcel.rb
/usr/lib/ruby/vendor_ruby/parseexcel/parser.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/spreadsheet-0.9.0.gemspec
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/spreadsheet-0.9.0.gemspec
/usr/share/doc/
/usr/share/doc/ruby-spreadsheet/
/usr/share/doc/ruby-spreadsheet/README.md
/usr/share/doc/ruby-spreadsheet/examples/
/usr/share/doc/ruby-spreadsheet/examples/xlsopcodes
/usr/share/doc/ruby-spreadsheet/copyright
/usr/share/doc/ruby-spreadsheet/GUIDE.md.gz
/usr/share/doc/ruby-spreadsheet/changelog.Debian.gz