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

import fileinput
import glob
import sys

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

for line in fileinput.input(files, inplace=True):
    if fileinput.isfirstline():
        sys.stderr.write('Started processing %s\n' %
                         fileinput.filename())
        sys.stderr.write('Directory contains: %s\n' %
                         glob.glob('etc_hosts.txt*'))
    line = line.rstrip().replace(from_base, to_base)
    print line

sys.stderr.write('Finished processing\n')
sys.stderr.write('Directory contains: %s\n' %
                 glob.glob('etc_hosts.txt*'))