/usr/lib/ruby/1.8/vim/common.rb is in vim-addon-manager 0.4.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48  | # vim-addons: command line manager of Vim addons
#
# Copyright (C) 2007 Stefano Zacchiroli
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# $Id: common.rb 866 2007-01-24 21:27:58Z zack $
require 'vim/constants'
module Vim
  def Vim.override_file(dir)
    File.join dir, OVERRIDE_FILE
  end
  @verbosity = 0
  class << self
    def increase_verbosity
      @verbosity += 1
    end
    def verbose?
      @verbosity >= 1
    end
    def warn(s)
      $stderr.puts "Warning: #{s}"
    end
    def info(s)
      puts "Info: #{s}"
    end
    def system(cmd)
      info "executing '#{cmd}'" if verbose?
      Kernel::system cmd
    end
  end
end
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