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+Syntax: dyndns-update.py <user> <password> <host> [ip]
+<code=python>
+import sys,os,re
+import urllib,socket
+def update(user,password,host,ip):
+        url = "http://%s:%s@members.dyndns.org/nic/update?hostname=%s&myip=%s" % (user,password,host,ip)
+        return urllib.urlopen(url).read()
+def local_ip():
+        return socket.gethostbyname(socket.gethostname())
+if len(sys.argv) < 4:
+        print "Syntax: %s <user> <password> <host> [ip]" % sys.argv[0]
+        sys.exit(1)
+(user,password,host) = sys.argv[1:4]
+if len(sys.argv) >= 5:
+        ip = sys.argv[4]
+else:
+        ip = local_ip()
+print "Updating %s to %s" % (host,ip)
+print "Result: %s" % update(user,password,host,ip)
+</code>