--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/python/netdiff.py	Mon Nov 18 11:28:30 2013 -0800
@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+
+"""
+compare differences of url contents
+"""
+
+import difflib
+import optparse
+import os
+import sys
+import urllib2
+
+here = os.path.dirname(os.path.realpath(__file__))
+
+def main(args=sys.argv[1:]):
+
+    usage = '%prog [options] from-url to-url'
+    parser = optparse.OptionParser(usage=usage, description=__doc__)
+    parser.add_option('--bash', '--command', dest='command',
+                      action='store_true', default=False,
+                      help="prepend output with bash command")
+    options, args = parser.parse_args(args)
+    if len(args) != 2:
+        parser.print_usage()
+        parser.exit(1)
+
+    contents = {}
+    for url in args:
+        contents[url] = urllib2.urlopen(url).read()
+
+    diff = difflib.unified_diff(contents[args[0]],
+                                contents[args[1]],
+                                fromfile=args[0],
+                                tofile=args[1],
+                                lineterm='')
+
+    # output
+    if options.command:
+
+        template = """%(PS1)s diff <(curl --location %(fromfile)s 2> /dev/null) <(curl --location %(tofile)s 2> /dev/null)"""
+        print template % dict(PS1='#',
+                              fromfile=args[0],
+                              tofile=args[1])
+
+    print '\n'.join(list(diff))
+
+if __name__ == '__main__':
+    main()