# File lib/rake/file_list.rb, line 293
    def egrep(pattern, *options)
      matched = 0
      each do |fn|
        begin
          File.open(fn, "r", *options) do |inf|
            count = 0
            inf.each do |line|
              count += 1
              if pattern.match(line)
                matched += 1
                if block_given?
                  yield fn, count, line
                else
                  puts "#{fn}:#{count}:#{line}"
                end
              end
            end
          end
        rescue StandardError => ex
          $stderr.puts "Error while processing '#{fn}': #{ex}"
        end
      end
      matched
    end