#!/usr/bin/env python
# encoding: utf-8
#
# Copyright (c) 2010 Doug Hellmann.  All rights reserved.
#
"""Simplistic grep implementation
"""
#end_pymotw_header

import fileinput
import sys

from_base = sys.argv[1]
to_base = sys.argv[2]
files = sys.argv[3:]

for line in fileinput.input(files, inplace=True):
    line = line.rstrip().replace(from_base, to_base)
    print line