/usr/lib/ruby/1.9.1/rake.rb is in libruby1.9.1 1.9.3.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright 2003-2010 by Jim Weirich (jim.weirich@gmail.com)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#++
require 'rake/version'
# :stopdoc:
RAKEVERSION = Rake::VERSION
# :startdoc:
require 'rbconfig'
require 'fileutils'
require 'singleton'
require 'monitor'
require 'optparse'
require 'ostruct'
require 'rake/ext/module'
require 'rake/ext/string'
require 'rake/ext/time'
require 'rake/win32'
require 'rake/task_argument_error'
require 'rake/rule_recursion_overflow_error'
require 'rake/rake_module'
require 'rake/pseudo_status'
require 'rake/task_arguments'
require 'rake/invocation_chain'
require 'rake/task'
require 'rake/file_task'
require 'rake/file_creation_task'
require 'rake/multi_task'
require 'rake/dsl_definition'
require 'rake/file_utils_ext'
require 'rake/file_list'
require 'rake/default_loader'
require 'rake/early_time'
require 'rake/name_space'
require 'rake/task_manager'
require 'rake/application'
$trace = false
# :stopdoc:
#
# Some top level Constants.
FileList = Rake::FileList
RakeFileUtils = Rake::FileUtilsExt
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