only join irc ,write a message and leave

ircconnect.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import socket, string
import codecs, sys

SERVER   = sys.argv[1]
PORT     = int(sys.argv[2])
PASS     = sys.argv[3]
NICKNAME = sys.argv[4]
CHANNEL  = "#%s" % sys.argv[5]
ENCODING = "utf-8"

ircserver = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

def connection():
  ircserver.connect((SERVER, PORT))

def send_data(command):
  ircserver.send(command + "\n")

def join(channel):
  send_data("JOIN %s" % channel)

def login(hostname="0", servername="*", realname=NICKNAME):
  send_data("PASS " + PASS)
  send_data("USER %s %s %s %s" % (NICKNAME, hostname, servername, realname))
  send_data("NICK " + NICKNAME)

if __name__ == "__main__":
  if len(sys.argv) < 7:
    print "usaeg -- python ircconnect.py hostname port password nickname channel message"
  else:

    connection()
    login()
    join(CHANNEL)

    while(1):
      buf = ircserver.recv(4096)
      msg = string.split(buf)
      if "JOIN" in msg:
        message = unicode(sys.argv[6],ENCODING)
        data = u"PRIVMSG %s :%s" % (unicode(CHANNEL, ENCODING), message)
        send_data(data.encode(ENCODING))
        ircserver.shutdown(socket.SHUT_RDWR)
        break
      elif "ERROR" in msg:
        print msg

Use with cron etc.