/usr/share/ofono/scripts/send-ussd is in ofono-scripts 1.12.bzr6858+14.04.20140318-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | #!/usr/bin/python
import sys
import dbus
if (len(sys.argv) < 2):
	print("Usage: %s [modem] <ussd-string>" % (sys.argv[0]))
	sys.exit(1)
bus = dbus.SystemBus()
manager = dbus.Interface(bus.get_object('org.ofono', '/'),
						'org.ofono.Manager')
modems = manager.GetModems()
if (len(sys.argv) == 2):
	path = modems[0][0]
	ussdstring = sys.argv[1]
else:
	path = sys.argv[1]
	ussdstring = sys.argv[2]
ussd = dbus.Interface(bus.get_object('org.ofono', path),
					'org.ofono.SupplementaryServices')
properties = ussd.GetProperties()
state = properties["State"]
print("State: %s" % (state))
if state == "idle":
	result = ussd.Initiate(ussdstring, timeout=100)
	print(result[0] + ": " + result[1])
elif state == "user-response":
	print(ussd.Respond(ussdstring, timeout=100))
else:
	sys.exit(1);
properties = ussd.GetProperties()
state = properties["State"]
if state == "idle":
	sys.exit(0)
print("State: %s" % (state))
while state == "user-response":
	response = input("Enter response: ")
	print(ussd.Respond(response, timeout=100))
	properties = ussd.GetProperties()
	state = properties["State"]
	if state != "idle":
		print("State: %s" % (state))
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