# FNAME = "ifconfig.txt"
  FNAME = "ifconfig_u18.txt"
  ADAPTERS = dict()
  
  with open(FNAME) as fid:
      # for linenumber, line in enumerate(fid.readlines()):
      for linenumber, line in enumerate(fid):
          # macstr = "HWaddr" # "ether"
          macstr = "ether" # "ether"
          print(line)
          if ("lo" not in line) and ("tun" not in line):
              if line and line[0] != " ":
                  infos = line.split()
                  if infos:
                      adapter = infos[0]
              if macstr in line:
                  idx = line.find(macstr)
                  startidx = idx + len(macstr) + 1
                  endidx = startidx + 17
                  macaddr = line[startidx:endidx]
          ADAPTERS[adapter] = macaddr
  
  FNAME_BASE = FNAME[:FNAME.rfind(".txt")]
  FNAME_OUT =  FNAME_BASE + "_adapters.txt"
  FNAME_OUT2 = FNAME_BASE + "_adapters_changed.txt"
  
  with open(FNAME_OUT, "w") as fid:
      for adapter, mac in ADAPTERS.items():
          fid.write("Adapter: " +  adapter + ", MAC: " + mac + "\n")
  
  BASEMAC = "01:23:45:ff:00:"
  with open(FNAME_OUT2, "w") as fid:
      for i, (adapter, mac) in enumerate(ADAPTERS.items()):
          mac_changed = BASEMAC + "%02x" %(i+1)
          mac_changed = BASEMAC + "{0:02x}".format((i+1))
          print(i, adapter, mac)
          fid.write("Adapter: " +  adapter + ", MAC: " + mac_changed + "\n")