# File lib/ohai/util/file_helper.rb, line 24
      def which(cmd)
        paths = ENV['PATH'].split(File::PATH_SEPARATOR) + [ '/bin', '/usr/bin', '/sbin', '/usr/sbin' ]
        paths.each do |path|
          filename = File.join(path, cmd)
          return filename if File.executable?(filename)
        end
        false
      end