Send a udp packet

sendpacket.py

#!/usr/bin/python

import socket
import sys

if __name__ == '__main__':
    if len(sys.argv) < 3:
        sys.stderr.write('require arguments. host port filename')
        sys.exit(1)
    host = sys.argv[1]
    port = int(sys.argv[2])
    filename = sys.argv[3]
    msg = open(filename, 'r').read()
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    addr = (host, port)
    sock.sendto(msg, addr)