#!/usr/bin/env python

import sys
import os

try:
    dirname = sys.argv[1]
    search_string = sys.argv[2]
except IndexError:
    exit('error: please provide a directory name and a search string')

try:
    files = os.listdir(dirname)
except IOError:
    exit('error: directory does not exist or is not readable')

line_count = 0

for filename in files:
    full_path = os.path.join(dirname, search_string)
    for file in files:
	file = open(file).readlines()
	if search_string in file:
            print search_string