#!/usr/bin/env python

# These are the two directories I want to work with.
# ip_path is the directory that store the old IP
# new_ip_path is the the directory that has the update IP
ip_path = '\Users\qnguyen\backup_conf'
new_ip_path = 'Users\qnguyen\new_ips'

import os, re

# my_reg take all the characters in the string up to .ip
my_reg = re.compile('(\w+)\.ip')
# This command should give me access to the root, directories and files in new_ip_path
for root,directories,files in os.walk(new_ip_path):
    # So I get all the name in that directory and put in in the list host_files
    host_files = [("%s.pl" % my_reg.match(h).group(1)) for h in files]

# for each name in host file, I want to open that file in the other path and replace the old IP with the new
for f in host_files:
    # open the text file and read in the the line.
    oldIPfile =  open(os.path.join(new_ip_path,f)
    my_newIP = oldIPfile.readline()
    # I don't get why there a syntax error. I'm just storing the line that I read in
    # Then I should open the directory that store the old IP and replace it with the new one
    my_string = re.comple('/^(\d+.?){4}$/')
    # for each line I want to find the old IP, which is in the line that contains ClientNameAlias
    # and replaces it with the new IP using sub()
    for line in open(os.path.join(ip_path,f))
        if "ClientNameAlias" in line:
            my_string.sub(my_newIP, line)
            print("%s 's old IP was replace." % f)
        else:
            print("%s could not be found" % f)